can see dwg tumbnail, but not open dwg

I have a bunch of dwgs that I can veiw their thumbnail, but not open
them. When I open them, they either say that they are invalid or,
"Unable to load this drawing file because it contains incorrect or
corrupted information." When I recover the ones it will try to (which
get the latter error at opening) it says that it cannot recover the
database from the drawing.

Is there any way to fix this?

Thank you,

Chewy

.

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