Hello! Ever since I upgrade to Windows 8.1 Pro, 64-bit, I’ve been experiencing a problem opening and re-opening SketchUp files. When I initially open SketchUp and open a current file, there’s no issue. It’s after I save and close the file, then try to open it again. I get the following error message…

This is a well known issue - there are several posts - see this one: Why does SU think the file is open? - #22 by bill_ruggirello

Specifically, close SketchUp, then turn off these 3 features in explorer, (as explained in the post below,) then rename the “ThumbsUp.DLL” file to something else “ThumbsOLD.DLL”, etc. Reboot the computer. [image] Why does SU think the file is open? SketchUp And I found ano…

Hello Dan! Thank you for the guidance. I’m using Windows 8.1 so the steps to “turn off” certain features is a bit different. I was able to take control of the SketchUp folder and files, so the issue has been resolved. Thank you very much!!! Jo Ann :smiley:

Hi. Solved this on my machine by turning off the preview pane then double-clicking the file as normal. I then turn the preview pane on and off as needed. Saves tinkering about with permanent setting changes.

[image] steve_roberts_ipad: I then turn the preview pane on and off as needed. ALT-P does the trick.

Unexpected File Format error! It had been hours of work :pensive: Really need help!

Read this article to see where SketchUp puts its auto save files. Hopefully you’ll find one that is in good condition: Setting Software and File Preferences | SketchUp Help

Problem with Open/File in SketchUp 2015

Technical Problems SketchUp

mahmadio July 27, 2015, 1:32pm 7

Unexpected File Format error! It had been hours of work
Really need help!

Unexpected File Format!

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Problem with Open/File in SketchUp 2015

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