FCX represents the faxable version of PCX, a proprietary format for Paintbrush. The latter is an image processing tool first designed for MS-DOS and then adapted for Windows. PCX used to have a significantly higher popularity before JPEG and PNG appeared, and nowadays it is rather rare. The FCX variant of PCX was created specifically for being sent and received through a fax modem device.
JPEG JPG PNG GIF TIFF TIF BMP ICO EMF WMF AI PDF EPS PS EPI WEBP WEBPLL JP2 PCX TGA DWG DWF DXF DGN WMZ CGM DRW GBR PCT MIF PLT PCL SVG WPG CIN DCX DIS HRU MTV PRC RAD PIC RLA QRT SGI XBM XPM SWF CAL PSD JXR BPG APNG DDS SVGZ CG4 FLIF