This article explains the different file formats that use the ACB file extension. It also explains how to open each type.
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A file with the ACB file extension is an Adobe Photoshop Color Book file. It provides an easy way to adhere to certain color standards, such as when printing an image rather than using it for on-screen purposes.
AutoCAD Color Book files also use the ACB extension. Files of this type store collections of colors that the AutoCAD software can use to fill surfaces and lines. They are useful for creating a template of colors that a company can use across all of their designs.
ACB is also the extension used for an archive file format used by AOL for software installations; ACB in this case stands for AOL Cab Launcher. Another use is as an audio package for some video games.