windows 7 - Invalid pipe character in file name

I’m on Windows 7 Pro x64 and I’ve downloaded a file using Firefox and it’s named guerriére | warrior.PNG with a pipe character (|) in file name and I can’t find how to delete or rename it.

Running fsutil 8dot3name query K: shows; K: is a USB NTFS drive:

The volume state for Disable8dot3 is 0 (8dot3 name creation is enabled).
The registry state of NtfsDisable8dot3NameCreation is 0 (Enable 8dot3 name creation on all volumes).
Based on the above two settings, 8dot3 name creation is enabled on K:.

But dir /x command doesn’t show short file names.

I've tried to use unlocker and DelinvFile.

Trying to delete it or the folder I receive response :

The file name you specified is not valid or too long. Specify a different file name.