It all depends. It might, but it depends on the extent of the damage.
It might be a simple few missing chars, or it could be extensive.
The best if you dont think you have anything sensitive in your files
is to upload them somewhere and someone can take a look for you. THe
files section of the group could be used.
Otherwise try opening the file in something like notepad, and seeing
if you can see any data in it. And if you can you might be able to
copy and paste bits at a time (<Placemark....</Placemark>)