Accidentally Deleted then Recovered .skp files do not open

Cannot open recovered files. Message says "Does not appear to be SketchUp file. Help anyone?

Could you upload the file here, so we could inspect?

Confirm the file extension is *.skp

This is one of many (unfortunately) files I cannot open.

I did. Still could not open,

The forum limits uploads to 3MB.
If your file is larger you’ll need to load it to a site with a larger limit.
Try Google Drive, DropBox or the 3D Warehouse and post a link back here.

Also please say more about what you did to “recover” the file. Did you find it in the trash bin and copy it back from there, or did you resort to some more drastic method or tool? Simply copying back from the trash should be ok, but other techniques could have subtly damaged the file.

Will send link to my G drive as soon as I get file(s) uploaded.

One of the causes for corrupt SKPs is the addition of corrupt image files used as SU materials. By any chance are you using the same material(s) in the problem files?