ShellExecuteEx failed: File not found error when trying to run anything in Heroic

Since a short while I am getting the above error trying to run anything through Heroic.

I have tried removing prefixes, redownloading games, redownloading the wine-ge through Heroic. It won't even run winecfg from the game's settings page.

I tried googling and searching here and on github, but I couldn't find anyone with that error, that actually fixed it.
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