These files add ActionScript and MXML syntax highlighting to gEdit
Instructions:
1 - Place 'actionscript.lang' and 'mxml.lang' in '/usr/share/gtksourceview-2.0/language-specs/'
sudo cp actionscript.lang /usr/share/gtksourceview-2.0/language-specs/
sudo cp mxml.lang /usr/share/gtksourceview-2.0/language-specs/
2 - Place 'actionscript.xml' and 'mxml.xml' in '/usr/share/mime/packages'
sudo cp actionscript.xml /usr/share/mime/packages/
sudo cp mxml.xml /usr/share/mime/packages/
3 - Update the 'mime' database :
sudo update-mime-database /usr/share/mime
4 - Voila, you're done