WK3 file extension is for Spreadsheet Lotus 123 version 3.x
Similar to WK3
3DS - Graphics Autodesk 3D Studio3FX - 3D effects CorelChart
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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
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