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I don't think it should be possible to delete itself, it's not an action of the computer or an antivirus ? But I'll check to add security when there is a file deletion. And recently opened file, you mean the recovery files ?

Recovery was perfectly ok and I was able to recover my files by using that. By recently opened files I mean the Projects tab at the Files | Projects | Folder - they still appeared there, but upon clicking them it says the file is corrupte, and when I went to where those files were previously saved the file was gone.
Only antivirus on my computer is Windows Defender. 

that's very surprising because PixelOver shouldn't delete file in another place than its own appdata folder. But I'll double check the place there is file deletion to add security (to ensure it's in appdata folder level)