Which are the files responsible for the menu on Gimp 2.6?

[Ofnuts]

You need the file-* executables in one of the plug-ins directory. You can check the contents of the pluginrc in your Gimp profile to see if they are listed. You  should have something like:

Code:

(plug-in-def "/usr/lib/gimp/2.0/plug-ins/file-png" 1494589443
   (proc-def "file-png-load" 1
        "Loads files in PNG file format"
        "This plug-in loads Portable Network Graphics (PNG) files."
        "Michael Sweet <mike@easysw.com>, Daniel Skarda <0rfelyus@atrey.karlin.mff.cuni.cz>"
        "Michael Sweet <mike@easysw.com>, Daniel Skarda <0rfelyus@atrey.karlin.mff.cuni.cz>, Nick Lamb <njl195@zepler.org.uk>"
        "1.3.4 - 03 September 2002"
        "PNG image"
        0
       (icon stock-id -1 "")
       (load-proc
           (extension "png")
           (magic "0,string,‰PNG\r\n\032\n")
           (mime-type "image/png"))
        ""
        3 1
       (proc-arg 0 "run-mode" "The run mode { RUN-INTERACTIVE (0), RUN-NONINTERACTIVE (1) }")
       (proc-arg 4 "filename" "The name of the file to load")
       (proc-arg 4 "raw-filename" "The name of the file to load")
       (proc-arg 13 "image" "Output image"))