Missing Folder

Hi! This JDög from Spain,

Some days ago I had to re-format my computer. I made a securitu copy of All my Cubase 7 Elements Projects in an external Disc. Now I try to open them and I can only use the VST tracks. The AUDIO TRACKS are ERASED!!! But I can see the “empty” tracks. I try to open them choosing the folder in the pool, but the answer is “Invalid File”

Could anybody help me please!!! :confused:

Thank You Very Much!!!