FFIVW file extension is for File Format for the Interchange of Virtual Worlds
Similar to FFIVW
3FX - 3D effects CorelChart3gp - 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
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