Upgrade from WiX 3.x to WiX 6.0 gives System.UnauthorizedAccessException: Access to the path "\\path" is denied.

[ivnatwft]

Hello FireGiant Community,

I need help upgrading the WiX version on my project.
I requested help to upgrade the version through the official website (I haven't gotten a reply).
In the meantime, I tried to use the Heatwave VS Community Extension to see if I could fix it on my own but I'm getting this Unauthorized error.

I was wondering if someone else ran across this error before that could give a hint of what is going on.

Let me know if a code sample is needed, I'm assuming I need to ask for permission to share code since this is a private project and not actually up in GitHub.

Here is the generated log file of my attempt:
HeatWaveConvert.log

Any kind of help is appreciated!

Kind regards,
Ivan C

[FireGiantHelp]

The log file shows the full path to the file:

[05/21/2025 12:28:59.416]: *** ERROR ***: Import failed with an exception.
System.UnauthorizedAccessException: Access to the path 
'D:\Dev\Setups\AlarmManagementAssemblies\AlarmManagementAssemblies.wixproj' is denied.

The file does need to be writable in order to be converted. Make sure the file is not marked read-only and that there is no other process locking the file.