I have a file that I have been working on that is no longer opens in Krita. To be more specific Krita crashes when I try to open this file. I very much hope that I haven't lost my file Any thoughts on this issue? Thanks.

It may be caused by many factors and can happen in absolutely every software. It happened to me in Photoshop quite a few times. My guess would be this isnt necesairly Kritas fault - may be some physical disk problem or whatever. I have never found reason for badly saved files under my Photoshop either...

Can you make a bug at bugs.kde.org with the file? It's possible that it's a regression.

I've posted a bug with the file.
https://bugs.kde.org/show_bug.cgi?id=327571