Do what Dave recommended about Repairs the app…
To get SKM files’ thumbnails to show their images in Windows Explorer try this…
Change the SKMs’ folder’s View to show [Extra] Large Icons.
Select one SKM file and right-click > context-menu > Open with…
Choose SketchUp Application and also tick the option to always use that app…
SketchUp will not open a SKM file directly, but the filetype associations should be fixed, and now your SKM files’ thumbnails should display their images.
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