How do you convert a 3GP file into something recognizable?

You can try Cucusoft DVD and Video converters suite which includes Cucusoft Ultimate DVD and Video Converter Suite. It is the best all-in-one DVD and video conversion software converts DVDs and videos to play on almost any portable device including iPod, iPhone, Zune, PSP, video capable MP3 players, video capable mobile phones, and Pocket P.C., etc.

Free Download, Flv to 3gp Software Collection Download.

This article shows you how to Extract audio from Flash video, FLV to MP3(MPEG Layer-3).

Software for 3gp 3g2 video converting, convert any video to 3gp 3g2.

You can free download this software free from here:
http://dvd-video-converters.com/dvdvideo...
Unbiased reviews and side-by-side comparisons of DVD video converter suite give you enough information to research the ins and outs of a particular product:
http://topsreviews.com/reviews/dvd-video...
For mac users, you can choose Aimersoft DVD Converter Suite for Mac:
http://macdvdconverter.com/mac-dvd-conve...
Also, you can google some other software:
http://www.google.com
I recommend you to try this powerful and easy-to-use video converter which a friend told me. is the most powerful video convert software. It is an all-powerful tool for users who want to put DVD movies and videos or audios on their players. This omnipotent video converter can both Rip DVD and Convert Video, Audio to AVI, MPEG, MKV, WMV, FLV, MOV, MP4, 3GP, 3GPP, MPG, ASF, VOB, WMA, M4A, MP3, etc.
It supports all common portable players such as iPod, iPhone 3GS, PSP, Zune, Archos, Creative Zen, Walkman, BlackBerry, Palm Pro, Gphone, Cell phone, etc. It also provides you with a series of video editing functions, such as video cropping, movie trimming and video effect adjustment. It enables you to preview video with two real-time preview windows out of your movies in an intuitive way.
You can see detail and free download it here:
http://www.flash-to-video.com/products/v...
certainly, http://answers.yahoo.com will offer you more options
I hope this may help you.
Prism Video Converter will convert 3GP to WMV (and other formats) that Windows Media Player can read.
It's a tiny download of less than half a meg so you can test it out within minutes.