The file extension ICC identifies so-called ICC profile files. ICC profiles are color profiles standardized by the International Color Consortium (ICC) that describe the working color space of an output or playback device such as a scanner, printer or monitor.
This is to ensure that the colors are reproduced as identically as possible in the process from image acquisition to processing to output. With ICC profiles, the devices are color matched.
Under Windows, the color profile files sometimes have the extension icm. You can easily install ICC and icm files by double-clicking or using the 'context menu -> install profile'. Usually, however, it makes more sense to use the desired color profile only in the program used. Programs such as Photoshop or PaintShop have their own color management.
In addition, there are several programs that can graphically represent ICC color profiles for analysis.