USP file extension is for PageMaker Printer font with U. S. ASCII extended character set
Similar to USP
3gp - Video format compatible with mobile devices3GR - 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
4MD - Musical file
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