Error when you run the IdFix tool: IdFix.exe is not a valid Win32 application
Original product version: Cloud Services (Web roles/Worker roles), Microsoft Entra ID, Microsoft Intune, Azure Backup, Office 365 Identity Management
Original KB number: 2859165
Symptoms
When you try to run the IdFix DirSync Error Remediation Tool in your on-premises Active Directory Domain Services (AD DS) environment, you receive the following error message:
IdFix.exe is not a valid Win32 application
Cause
This issue occurs if you're running the IdFix tool on an operating system that's not supported for the tool.
Resolution
Install and run the IdFix tool on a computer that's running the 64-bit version of Windows 7 or a later version.
More information
For more information about the IdFix tool, see IdFix DirSync Error Remediation Tool (This includes a list of system requirements.).
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