please, dont open *.3gp files by default...
My firefox app sends 3gp files from the web to pa to open them with the video player. disabling the internal videoplayer won't help.
The app supports this format, but doesn’t open them by default.
When you open a file, Android will display the list of apps which support the file format. If a single one is found it will be opened by default. Otherwise Android display the list of apps which can play the file. When you select an app, make sure to press the Once button otherwise Android will remember and always use this kind of file with the selected player. You can then go into Android Setting/Apps to clear this association