It's worthwhile knowing that the calendar is just a view of a folder in an Exchange mailbox, and accepting just moves the item into the calendar folder.

Looks like Welsh, it's definitely not a Goidelic language.

But proton isn't an emulator? It's an API converter

Ok so I've fixed it, appears to have been an issue with the tool having come from my backup rather than installed directly.

couldn't uninstall due to "missing shared content" so i deleted the file and verified integrity so it downloaded them - everything is now running perfectly, tried a few different games and they are working great.

cheers for all the help!