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Because the documentation for GetTempPath nows says apps should call GetTempPath2.[0] Starting with Windows 11[1], and recently Windows 10[2], GetTempPath2 was added. The difference being that elevated processes are returned a different directory. Usually 'C:\Windows\SystemTemp'. Currently temporary files of an elevated process may be placed in a world write-able location. GetTempPath2, by default, but can be overridden, places it in a directory that's only accessible by SYSTEM and administrators. [0] https://learn.microsoft.com/en-us/windows/win32/api/fileapi/nf-fileapi-gettemppathw#remarks [1] https://learn.microsoft.com/en-us/windows/win32/api/fileapi/nf-fileapi-gettemppath2w (Minimum supported client - Windows 11 Build 22000) [2] https://blogs.windows.com/windows-insider/2025/03/13/releasing-windows-10-build-19045-5674-to-the-release-preview-channel/ (This update enables system processes to store temporary files ...) [ChangeLog][QtCore][Important Behavior Changes] On Windows, generating temporary directories for processes with elevated privileges may now return a different path with a stricter set of permissions. Please consult Microsoft's documentation from when they made the same change for the .NET framework: https://support.microsoft.com/en-us/topic/gettemppath-changes-in-windows-february-cumulative-update-preview-4cc631fb-9d97-4118-ab6d-f643cd0a7259 Pick-to: 6.9 6.8 6.5 5.15 Change-Id: I5caf11151fb2f711bbc5599231f140598b3c9d03 Reviewed-by: Marc Mutz <marc.mutz@qt.io>