The mcs file extension is associated with Mimics by Materialise NV.
Image created by Mathcad, a mathematics program used for engineering calculations; contains a raster graphic generated by the application; used to store graphics captured in Mathcad.
The mcs file extension is associated with MathCAD by Mathsoft, which is now part of Parametric Technology Corporation.
The mcs file extension is associated with The Only Sheet+ (TOS+), a very powerful character creaton and maintanance workbook for both Dungeons & Dragons v3.5 and the The Pathfinder Roleplaying Game rule systems, created by R. Taillon. This file extension is used for older version of this software and the newest version uses .tos version instead and is not able to open the mcs files.