Please look into the below mobile file extensions,hope this may help.
.JAR - Java Archive
.JAD - Java Application Descriptor
.SIS - Symbian Installation Source
.SISX - Newer file format for Symbian application
installers
.NTH - Nokia Theme Studio File
.NRT - Nokia Ring Tone
.NAVIONICS - GPS chart format
.SWF - Shockwave Flash
.3GP - Third Generation Platform
.Mp3 - MPEG-1 Audio Layer 3
.MP4 - Motion Picture Experts Group
.Nokia - Nokia proprietary ringtone format
.wma - - Windows Media Audio
.amr - Adaptive Multi-Rate compressed audio
.wgz - Nokia Widget Archive
.xhtml - Mobile web pages
.html - Mobile web pages for smartphones
.nrt - Nokia Ringtone file
.rng - Nokia Communicator ringing tone
