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  <xs:element id="gpifs_InvestmentAdvisoryAgreementIncentiveRateQuarterlyHurdleRateMember" abstract="true" name="InvestmentAdvisoryAgreementIncentiveRateQuarterlyHurdleRateMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="gpifs_InvestmentAdvisoryAgreementIncentiveRateAnnualizedHurdleRateMember" abstract="true" name="InvestmentAdvisoryAgreementIncentiveRateAnnualizedHurdleRateMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="gpifs_InvestmentAdvisoryAgreementIncentiveRatePreIncentiveFeeNetInvestmentIncomeBelowCatchUpMember" abstract="true" name="InvestmentAdvisoryAgreementIncentiveRatePreIncentiveFeeNetInvestmentIncomeBelowCatchUpMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="gpifs_InvestmentAdvisoryAgreementIncentiveRateQuarterlyCatchUpThresholdMember" abstract="true" name="InvestmentAdvisoryAgreementIncentiveRateQuarterlyCatchUpThresholdMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="gpifs_InvestmentAdvisoryAgreementIncentiveRateAnnualizedCatchUpThresholdMember" abstract="true" name="InvestmentAdvisoryAgreementIncentiveRateAnnualizedCatchUpThresholdMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="gpifs_InvestmentAdvisoryAgreementIncentiveRatePreIncentiveFeeNetInvestmentIncomeExceedsCatchUpThresholdMember" abstract="true" name="InvestmentAdvisoryAgreementIncentiveRatePreIncentiveFeeNetInvestmentIncomeExceedsCatchUpThresholdMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="gpifs_InvestmentAdvisoryAgreementIncentiveRatePostHurdleRateAndCatchUpMember" abstract="true" name="InvestmentAdvisoryAgreementIncentiveRatePostHurdleRateAndCatchUpMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="gpifs_InvestmentAdvisoryAgreementIncomeIncentiveFeeMember" abstract="true" name="InvestmentAdvisoryAgreementIncomeIncentiveFeeMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="gpifs_InvestmentAdvisoryAgreementIncentiveRateRealizedCapitalGainsMember" abstract="true" name="InvestmentAdvisoryAgreementIncentiveRateRealizedCapitalGainsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="gpifs_AdministrationAgreementMember" abstract="true" name="AdministrationAgreementMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="gpifs_ManagingDealerAgreementMember" abstract="true" name="ManagingDealerAgreementMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="gpifs_ExpenseSupportAndConditionalReimbursementAgreementMember" abstract="true" name="ExpenseSupportAndConditionalReimbursementAgreementMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="gpifs_ExpenseSupportPaymentMember" abstract="true" name="ExpenseSupportPaymentMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="gpifs_ReimbursementPaymentMember" abstract="true" name="ReimbursementPaymentMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="gpifs_GPIFSFundingAndGPIFSHoldingsMember" abstract="true" name="GPIFSFundingAndGPIFSHoldingsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="gpifs_ManagementAndServiceFeesNumberOfComponents" abstract="false" name="ManagementAndServiceFeesNumberOfComponents" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:integerItemType"/>
  <xs:element id="gpifs_RelatedPartyAgreementInitialTerm" abstract="false" name="RelatedPartyAgreementInitialTerm" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:durationItemType"/>
  <xs:element id="gpifs_RelatedPartyTransactionTerminationNoticePeriod" abstract="false" name="RelatedPartyTransactionTerminationNoticePeriod" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:durationItemType"/>
  <xs:element id="gpifs_RelatedPartyTransactionShareholderServicingAndDistributionFeesAnnualRate" abstract="false" name="RelatedPartyTransactionShareholderServicingAndDistributionFeesAnnualRate" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:pureItemType"/>
  <xs:element id="gpifs_RelatedPartyTransactionVariableDealerFeePercent" abstract="false" name="RelatedPartyTransactionVariableDealerFeePercent" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="gpifs_RelatedPartyTransactionExpensePaymentPeriod" abstract="false" name="RelatedPartyTransactionExpensePaymentPeriod" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:durationItemType"/>
  <xs:element id="gpifs_RelatedPartyTransactionExcessOperatingFundsPaymentPeriod" abstract="false" name="RelatedPartyTransactionExcessOperatingFundsPaymentPeriod" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:durationItemType"/>
  <xs:element id="gpifs_RelatedPartyTransactionAmountsOutstanding" abstract="false" name="RelatedPartyTransactionAmountsOutstanding" nillable="true" xbrli:periodType="instant" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="gpifs_UnreimbursedExpenseSupportPaymentMember" abstract="true" name="UnreimbursedExpenseSupportPaymentMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="gpifs_RelatedPartyTransactionRollForward" abstract="true" name="RelatedPartyTransactionRollForward" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:stringItemType"/>
  <xs:element id="gpifs_DebtSecuritiesSeniorSecuredLoanMember" abstract="true" name="DebtSecuritiesSeniorSecuredLoanMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="gpifs_DebtSecuritiesOneStopLoanMember" abstract="true" name="DebtSecuritiesOneStopLoanMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="gpifs_DebtSecuritiesSecondLienMember" abstract="true" name="DebtSecuritiesSecondLienMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="gpifs_USMidAtlanticRegionMember" abstract="true" name="USMidAtlanticRegionMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="gpifs_InvestmentsAtAmortizedCostMember" abstract="true" name="InvestmentsAtAmortizedCostMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="gpifs_AerospaceAndDefenseSectorMember" abstract="true" name="AerospaceAndDefenseSectorMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="gpifs_HealthcareEquipmentSuppliesSectorMember" abstract="true" name="HealthcareEquipmentSuppliesSectorMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="gpifs_OilGasConsumableFuelsMember" abstract="true" name="OilGasConsumableFuelsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="gpifs_IndustryConcentrationRiskMember" abstract="true" name="IndustryConcentrationRiskMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="gpifs_DerivativeAverageNotionalAmount" abstract="false" name="DerivativeAverageNotionalAmount" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="gpifs_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetIssuancesSettlementsOfUndrawnPortionOfRevolvingLoans" abstract="false" name="FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetIssuancesSettlementsOfUndrawnPortionOfRevolvingLoans" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="gpifs_FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPaidInKindInterestAndNonCashDividends" abstract="false" name="FairValueMeasurementWithUnobservableInputsReconciliationRecurringBasisAssetPaidInKindInterestAndNonCashDividends" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="gpifs_FairValueMeasurementWithUnobservableInputsReconciliationAcquisitionOfInvestments" abstract="false" name="FairValueMeasurementWithUnobservableInputsReconciliationAcquisitionOfInvestments" nillable="true" xbrli:periodType="duration" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="gpifs_DebtSecuritiesSecondLienLoanMember" abstract="true" name="DebtSecuritiesSecondLienLoanMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="gpifs_MeasurementInputMarketInterestRateMember" abstract="true" name="MeasurementInputMarketInterestRateMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="gpifs_MeasurementInputBrokerQuotesMember" abstract="true" name="MeasurementInputBrokerQuotesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="gpifs_ValuationMarketRateApproachMember" abstract="true" name="ValuationMarketRateApproachMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="gpifs_ValuationMarketComparableCompanyMember" abstract="true" name="ValuationMarketComparableCompanyMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="gpifs_ValuationTechniqueBrokerQuotesMember" abstract="true" name="ValuationTechniqueBrokerQuotesMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="gpifs_PromissoryNotesOSCaymanTrustMember" abstract="true" name="PromissoryNotesOSCaymanTrustMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="gpifs_PromissoryNotesREITFundingMember" abstract="true" name="PromissoryNotesREITFundingMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="gpifs_AdviserRevolverMember" abstract="true" name="AdviserRevolverMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="gpifs_InvestmentCompanySeniorSecurityIndebtednessAssetCoverageRatioMinimumThreshold" abstract="false" name="InvestmentCompanySeniorSecurityIndebtednessAssetCoverageRatioMinimumThreshold" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:pureItemType"/>
  <xs:element id="gpifs_DebtInstrumentNumberOfNotesSold" abstract="false" name="DebtInstrumentNumberOfNotesSold" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:sharesItemType"/>
  <xs:element id="gpifs_DebtInstrumentNumberOfSharesIssuedPerNote" abstract="false" name="DebtInstrumentNumberOfSharesIssuedPerNote" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:sharesItemType"/>
  <xs:element id="gpifs_FacilityFees" abstract="false" name="FacilityFees" nillable="true" xbrli:periodType="duration" xbrli:balance="debit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="gpifs_DebtAnnualizedWeightedAverageInterestRate" abstract="false" name="DebtAnnualizedWeightedAverageInterestRate" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="gpifs_LongTermDebtGrossMaturityLessThan1Year" abstract="false" name="LongTermDebtGrossMaturityLessThan1Year" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="gpifs_LongTermDebtGrossMaturity1Through3Years" abstract="false" name="LongTermDebtGrossMaturity1Through3Years" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="gpifs_LongTermDebtGrossMaturity3Through5Years" abstract="false" name="LongTermDebtGrossMaturity3Through5Years" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="gpifs_LongTermDebtGrossMaturityMoreThan5Years" abstract="false" name="LongTermDebtGrossMaturityMoreThan5Years" nillable="true" xbrli:periodType="instant" xbrli:balance="credit" substitutionGroup="xbrli:item" type="xbrli:monetaryItemType"/>
  <xs:element id="gpifs_UndrawnRevolverMember" abstract="true" name="UndrawnRevolverMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="gpifs_InvestmentCompanyTotalExpensesToAverageNetAssets" abstract="false" name="InvestmentCompanyTotalExpensesToAverageNetAssets" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="gpifs_InvestmentCompanyIncentiveFeeWaiverToAverageNetAssets" abstract="false" name="InvestmentCompanyIncentiveFeeWaiverToAverageNetAssets" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="gpifs_InvestmentCompanyIncomeTaxToAverageNetAssets" abstract="false" name="InvestmentCompanyIncomeTaxToAverageNetAssets" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="gpifs_InvestmentCompanyNetExpensesToAverageNetAssets" abstract="false" name="InvestmentCompanyNetExpensesToAverageNetAssets" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="gpifs_InvestmentCompanyExpenseRatioBeforeIncentiveFees" abstract="false" name="InvestmentCompanyExpenseRatioBeforeIncentiveFees" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="gpifs_InvestmentCompanyTotalReturnAnnualizedPercent" abstract="false" name="InvestmentCompanyTotalReturnAnnualizedPercent" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="gpifs_LongTermDebtAverageAmountOutstandingPerShare" abstract="false" name="LongTermDebtAverageAmountOutstandingPerShare" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:perShareItemType"/>
  <xs:element id="gpifs_InvestmentCompanySeniorSecurityIndebtednessAssetCoverageRatioPerUnit" abstract="false" name="InvestmentCompanySeniorSecurityIndebtednessAssetCoverageRatioPerUnit" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="dtr-types:perShareItemType"/>
  <xs:element id="gpifs_InvestmentCompanyNetEffectOfExpenseSupportAndExpenseSupportRecoupmentToAverageNetAssets" abstract="false" name="InvestmentCompanyNetEffectOfExpenseSupportAndExpenseSupportRecoupmentToAverageNetAssets" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:percentItemType"/>
  <xs:element id="gpifs_ShareRepurchaseProgramMaximumPercentageOfNetAssetValueOfCommonStockOutstandingIntendedToBeRepurchased" abstract="false" name="ShareRepurchaseProgramMaximumPercentageOfNetAssetValueOfCommonStockOutstandingIntendedToBeRepurchased" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:pureItemType"/>
  <xs:element id="gpifs_ShareRepurchaseProgramNoticePeriod" abstract="false" name="ShareRepurchaseProgramNoticePeriod" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="xbrli:durationItemType"/>
  <xs:element id="gpifs_EarlyRepurchaseDeductionPercentage" abstract="false" name="EarlyRepurchaseDeductionPercentage" nillable="true" xbrli:periodType="instant" substitutionGroup="xbrli:item" type="xbrli:pureItemType"/>
  <xs:element id="gpifs_PublicOfferingMember" abstract="true" name="PublicOfferingMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="gpifs_O2026M1DividendsMember" abstract="true" name="O2026M1DividendsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="gpifs_O2026M2DividendsMember" abstract="true" name="O2026M2DividendsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="gpifs_O2026M3DividendsMember" abstract="true" name="O2026M3DividendsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="gpifs_O2026M4DividendsMember" abstract="true" name="O2026M4DividendsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="gpifs_O2026M5DividendsMember" abstract="true" name="O2026M5DividendsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="gpifs_O2026M6DividendsMember" abstract="true" name="O2026M6DividendsMember" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:domainItemType"/>
  <xs:element id="gpifs_InvestmentCompanyDistributionsToShareholdersPerShareOrdinary" abstract="false" name="InvestmentCompanyDistributionsToShareholdersPerShareOrdinary" nillable="true" xbrli:periodType="duration" substitutionGroup="xbrli:item" type="dtr-types:perShareItemType"/>
</xs:schema>
