I recently lost all files on external hard drive, but managed to recover the majority of them. However, my original .skp files are not there, just the .skb files. I have googled this issue so much, and tried everything (the latest being renaming the file as .skp). This changed the file type to a Sketchup Model, but sketchup still does not recognise it when I try to open it! Please help! This is the only backup I have and it is quite urgent that I can access it.