Help with desktop-file-install

[Gianluca Sforna]

In the latest rawstudio buildlog I see the following warnings:

+ desktop-file-install --vendor fedora --dir
/var/tmp/rawstudio-0.5-1.fc7-root-mockbuild/usr/share/applications
--add-category X-Fedora --delete-original
/var/tmp/rawstudio-0.5-1.fc7-root-mockbuild/usr/share/applications/rawstudio.desktop
/var/tmp/rawstudio-0.5-1.fc7-root-mockbuild/usr/share/applications/rawstudio.desktop:
missing encoding  (guessed UTF-8)
/var/tmp/rawstudio-0.5-1.fc7-root-mockbuild/usr/share/applications/fedora-rawstudio.desktop:
warning: The 'Application' category is not defined by the desktop
entry specification.  Please use one of "AudioVideo", "Audio",
"Video", "Development", "Education", "Game", "Graphics", "Network",
"Office", "Settings", "System", "Utility" instead

Questions:
1. is the --add-category X-Fedora not required anymore?
2. how to fix the encoding ?
3. is --remove-category Application enough to fix the last one?

TIA

Gianluca