External files lost..

A co-worker of mine, ask if he could copy some movies on my external drive which i brought to work, he transfered the movies in the laptop which we ussually use to troubleshoot first class aircraft seats.. when my external drive returned i was about to transfer to the companies network.. To share videos and movies to my co worker- by my surprize my files and folders, changed its format to .exe everything is in .exe. I disconnected the drive. The reconnect it again all files were lost.. What i tried:



Tried detecting the virus with : Sophos anti-virus
Changed my PC (home) : setting show hidden files (system files and encrypted)
Used cmd way : attrib -h -r -s /s /g [drive]:\*.*

Sophos results: 1 files encrypted,but no virus was detected, no hidden files found..