Files that contain the .act file extension are most commonly associated with audio files that have been recorded by a variety of voice recording devices players. These ACT files are compressed using Adaptive Differential Pulse Code Modulation. The ACT files can then be converted to the MP3 file format for playback on MP3 audio players.
The .act file extension is also commonly used for Adobe color table files. The Adobe Photoshop application uses color look-up tables to store a collection of pre-defined colors that are used by the software. These ACT files are used to add or reduce the number of colors in the application's CLUT file.
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If you have additional information about the ACT file format or software that uses files with the ACT suffix, please do get in touch - we would love hearing from you.