Starting with version 4.0, PCTeX's BMP commands support most popular bitmap graphic formats as long as they don't use LZW compression.
The BMP commands can be found by going to the "Help" menu, selecting "PCTeX Helper", selecting the "Graphics" menu, and then selecting "BMP".
Note for users of 4.0 and 4.2: PCTeX must be in the PostScript rendering mode (go to the "Settings" menu, select "Default Settings", click on the "Advanced" tab, under "Method for rendering DVI" select "PostScript", and then close and reopen PCTeX) to use these graphic formats.