There is only one file type that uses the .PCX extension:
Paintbrush Bitmap Image File
Raster image format developed by ZSoft; became one of the original bitmap image formats for the DOS/Windows platform; supports 24-bit color images, 8-bit grayscale and indexed color images, and 1-bit black and white images; compressed using RLE encoding.
The PCX file format has mostly been replaced by newer image formats, but is still used by some fax and scanning applications. Multi-page PCX fax documents use the .DCX extension.
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Updated: December 19, 2018