Similar to R2D

3FX - 3D effects CorelChart
3gp - Video format compatible with mobile devices
3GR - VGA graphics driver Windows Video grabber
3T4 - Util3 Binary file converter to ASCII
4C$ - 4Cast/2 Datafile
4GE - Informix 4G Compiled source code file
4GL - Informix 4GL language source code file

View all in File Extensions