This is a symptom of the W32.Blebla worm. This is a very old one, so I wonder how did you manage to get this infection or if this is a new variant.
See the Symantec page on this worm for more information.
Unfortunately it seems that all (document, media, archive) files are replaced by executable virus files, thus the original data is lost. (Do you really have these hidden doc files in the same directory?). To be more precise, the virus description says:
When a file with any of these extensions is launched, the worm will
move the file into C:\Recycled under a random file name and replace
the original file with itself, adding .exe to the suffix. For example,
song.mp3 will become song.mp3.exe, and this file will be the worm. The
original file is not executed.
I think at least one of your windows clients have been infected by the worm, so on this machine there might be some remnants of data in the
You should remove all parts of the virus first on all the windows clients, then try to recover the data if possible. Although it would be wise to create a full backup of the offline system to minimise data loss if something goes wrong.
Finally make sure to remove the infected files from any network shares that were accessible by the windows clients.