I have a Nokia N73 with a memory card, if I remove the memory card and slot it into the processor I can drag and drop mp3 files and video clips onto it however , when putting it back into the phone it will only recognize the mp3 files and not the video files, apparently real player supports files with extensions such as .3gp mp4 or.rm, is there a way of converting my video files into these files?

You can try AnyMP4 Media Converter V.6.0. it supports MP4, 3GP, AVI, MPEG1, MPEG2, Xvid, Dixv, WMV, ASF, VOB, VCD, DVD, RM, RMVB...

You have to convert your videos to 3GP for the Nokia to play it. Remember, the more files you have in your Cell, the slower you'll be able to browse things in your Cell/Mobile. I'm using Nokia 6230i and when I go to gallary, it take forever.

Peace