Cygwin doesn't support IO_REPARSE_TAG_APPEXECLINK

Marco Atzeri
Sat May 23 15:50:53 GMT 2020

On 23.05.2020 17:09, Kagami Rosylight via Cygwin wrote:
> Hi Cygwin community,
> I found that Cygwin can’t run UWP based CLI tools, as they expose their executables as reparse points with the tag IO_REPARSE_TAG_APPEXECLINK which Cygwin does not support.
> Way to reproduce this issue on Cygwin:
> 1. Install Python from Microsoft Store: (assuming you don’t already have python3.8 on your PATH.)
> 2. Try running `python3.8` on Cygwin. It will say “/cygdrive/c/Users/Kagami/AppData/Local/Microsoft/WindowsApps/python3.8: Permission denied”
> 3. Check it’s real path by `get-childitem -path C:/Users/Kagami/AppData/Local/Microsoft/WindowsApps/python3.8.exe` on PowerShell. It’s `C:\Program Files\WindowsApps\PythonSoftwareFoundation.Python.3.8_3.8.1008.0_x64__qbz5n2kfra8p0\python3.8.exe`.
> 4. Try running python again with that path. This succeeds.
> I posted this issue on MSYS2 GitHub repo ( but I think Cygwin is the right place to file this.
> Relevant prior works:
> * Python
> * libuv
> * PowerShell
> Thanks,
> -Kagami

Not clear why you expect that a Windows specific tag as
IO_REPARSE_TAG_APPEXECLINK should be supported on a Posix platform ?

Moreover all the documentation from MS seems

that seems a bit short to help third party in properly using it.


PS: Python 3.8 is available as Cygwin binary

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