Thank you for fast response.
He just explained he was working with his SKP 2021 on server based file that was previously saved on another PC in the network with SKP 2017. Instead of using ‘Save as’ option, he just saved the file and closed the software without any problem, but then he couldn’t open it again.
If I had that 2017 version file I would try doing saves, and see if it then got corrupted.
Can anyone recover my file too… had this issue and my deadline is in 2 days… Please ASAP.
IDK how this got me into “Unexpected file format”
@colin Can you please try to retrieve my files?
https://we.tl/t-onZaZU7Gsm
Neither file recovered anything useful. If you go to the file in File Explorer, and get Properties on the SKP, the History tab may have previous versions of the file, if you have that Windows 10 feature turned on.
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The most common cause is saving to a non-local drive, i.e.a network location. First save to a local drive then copy to the network. When opening DL the file to the local drive then open.
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Thanks @colin, I redid all my work from sratch again… phew… Thanks mate.
Thanks @RLGL I will in every project from now on thanks guys! 
Can anyone recover my file too… I got the “Unexpected file format” message too,
@colin Can you please try to retrieve my files?
FIle linke here:
I wasn’t able to recover the file. I will ask the developers to take a look.
Can someone please help me too. I got the same error ‘‘Unexpected file format’’. I tried renaming, recovering, but nothing worked. @colin can you please help me?
File link: Dropbox - sketchup file - Simplify your life
As with other cases, I only could rescue the components and materials. Here’s the recovered file:
Thank you for your help.
@colin can you please help recover my file. thank you before. 3d.skp - Google Drive
Unfortunately, no, I couldn’t recover anything from your file.
Hi, colin,
I have been facing this issue (i.e., Unexpected file format), please help me to get rid of it.
The files are very small and attached herewith.
Thank you.
1.skp (8.5 MB)
AutoSave_AutoSave_AutoSave_kdfw_fsxp3d_1.skp (8.4 MB)
Sorry that I didn’t see your post 13 days ago. I did try to recover the file, but failed.
Hi Colin, please, I need your help. I was ready to render was already exporting to .dae and than it happen (the horror!) - Unespected File Format
Please, try to recovermy file!
https://we.tl/t-dhpvDYvK4a
I wasn’t able to recover much. A lot of materials and some components.
Do you use LightUp? It’s not important with regard to the file becoming corrupted, but I was curious what renderer you were going to use. Were you going to export with LightUp?
Here is what I managed to recover:
Thank you sooo much Colin, my meeting is in an our and I’ll still try to render in Lumion
Pease help! I EXPERIENCE THE SAME PROBLEM.
In order to help you, you need to share the SketchUp model file. If it is too large to upload directly to the forum, upload it to Drop Box or similar and share the link