A c2s file extension is related to the Click2Stitch and used for its embroidery files.
C2S file extension - Click2Stitch embroidery data
What is c2s file? How to open c2s files?
File type specification:
The c2s file extension is associated with the Click2Stitch, an embroidery tool for Microsoft Windows operating system.
The c2s file stores embroidery design.
The G7 Solutions Click2Stitch seems to be obsolete product without support from developer.