.ACT File Extension

Audio format recorded by some voice recorders and MP3 players; compressed using Adaptive Differential Pulse Code Modulation

Color lookup table (CLUT) file used by Adobe Photoshop, an application used for editing raster graphics; stores a collection of pre-defined colors; used for applying a CLUT to an image in the "Save for Web" dialog in Photoshop.

ACT files are used for optimizing images for Web publishing. By adding or reducing the number of colors in the CLUT, users can examine the quality of the image versus the resulting file size before saving it.

Adobe color tables can be loaded in the Save for Web dialog box by selecting the Color Table menu and choosing Load Color Table.... Several predefined ACT files are included with the Photoshop installation in the /Presets/en_US/Save for Web Settings/Color Tables/ directory.

NOTE: CLUTs are used by some image formats in the Save for Web dialog, such as .GIF. However, they are not used by .JPG and .PNG files.

Shows the hierarchical relations within the code of a FoxPro application; created by the Documenting Wizard (Tools menu→Wizards→Documenting)

Three-dimensional character, or "actor," saved in the Genesis 3D format; may include object motions, skins, and materials; actor files can be created directly within Genesis3D or by converting other 3D formats to the ACT format using Genesis3D Actor Studio.

Genesis3D is an open-source real-time 3D rendering engine used primarily for creating 3D games. The Genesis 3D engine pack includes the Actor Studio, Actor Viewer, and other files. More information is available at the Genesis3D website.

File used by DS Game Maker, an application used to create Nintendo DS games; contains a game action written in C; used for displaying graphics, playing sounds, creating transitions, and controlling game logic, as well as other actions.

Custom actions can be created from templates provided in the DS Game Maker Action Editor interface. ACT files are stored in the \Actions\ directory of the DS Game Maker installation.

ACT files are saved with a corresponding .ACTX file, which contains a description for the action.