Difference between ICC and ICM file

There are softproof profiles that have the file extension .icc and the extension .icm. There is no difference between the two file types ICM (Image Colour Matching Profile) and ICC profile, both extensions describe the same file type. Both file types can be used identically, the files work on Windows systems as well as on Macintosh.

Professional programmes such as Adobe Photoshop and Lightroom recognise both extensions.