Help, Editor wont let me open sketch

I moved some of my sketches into a folder to be a bit more organised and since moving I cannot open half the sketches including one I’ve been working on tweaking for months - HELP!

Can anyone advise how to recover this as it will take ages for me to re-write the code and I was relying on cloud security here.

The attachment shows the error I’m getting and it is version 3_4 I need to recover ASAP.

Any help appreciated.
Many thanks.

Arduino Error.pdf (353 KB)

Information passed upstairs but if you also want to report it HERE it may help.

Thanks, I'll log it via the link you posted.