Hello,
When opening some .ppt files, I get an error which says “An error has occurred while opening the file”. I have named the screenshot “error ppt”.
Thanks
OS version: Windows 10 Pro 22H2
App version: 7.5.1.23 (x64 exe)
Downloaded from: ONLYOFFICE website
Hello, @nicesto to reproduce the issue, we need your presentation file.
May I kindly request you to provide it? 
Hello,
Just to let you know that the issue is solved. Three presentation files can open now. I assume this was a bug. Probably an update fixed this problem. You can close this topic now.
Thanks
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