Encrypt Dropbox files and folders on the Fly Using Box

Hi there,
This GIMP message appears when I want to open a file from my Dropbox and the format of the file is .jpeg. I can open any other files from my PC and it seems like is a problem with this one. Any solution for this error ? What I did wrong ?
Thanks !

GIMP Message
Opening ‘C:Userstrevor dDropboxtest boxcryptor5eEotox51vbBeORrvM9LRdD,LNVt16PAozb3eaepDt-YyH3’ failed: Unknown file type
OK
