Sketchup Pro Unexpected File Format

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Found 24 file extension associations related to SketchUp and 7 file formats developed specifically for use with SketchUp. The Pro version extends exporting support to include the 3DS, DAE, DWG, DFX, FBX, OBJ, XSI, and WRL file formats. Download ulaunch elf iso untuk flashdisk.

I have been working on a small project, as yet unfinished - and when I saved the job, I received a message 'No Error Found'
I then tried to 'save as' a different file name - same message appeared.
Numerous attempts to save ended with the same result,
When next I opened sketchup, I tried to re-load the file and now recieve a 'Unexpected File Format' message.
The file I want to load shows up in Windows Explorer (thumbnail mode) with a small thumbnail OK and a file size of 1216 kB.
I even re-named the .skb file and tried to load that, with no luck what so ever.
Anyone have any ideas or suggestions on how I can recover this
Previously created projects (different jobs) all open okay, as a test of Sketchup itself.