pcmanfm desktop file has the deprecated x-directory/normal mimetype
Warning in file "/usr/share/applications/pcmanfm.desktop": usage of MIME type "x-directory/normal" is discouraged ("x-directory" is an old media type that should be replaced with a modern equivalent)
Maybe better the file, instead of this commmit, since its a bit updated:
https://gitorious.org/trisquel-package-helpers/helpers/blobs/toutatis/helpers/make-pcmanfm
I added this now in a helper script:
https://gitorious.org/trisquel-package-helpers/helpers/commit/bd136a4f38bf664854bf69b9b112d4a61a940d56