The File Extensions Database

.ACF File Extension

  • Developer by: Valve
  • Category: Game Files
  • Format: Binary

What is an .ACF file?

.ACF is Steam Application Cache File

An ACF file is a cache file used by Valve Steam, a software package used for downloading games. It saves information related to the downloaded software and is used for the original download as well as game updates.

ACF files are used by newer versions of the Steam content delivery system. Older versions use .GCF and .NCF files.

Programs that open Steam Application Cache File
Valve Steam
Valve Steam
File Type 2 X-Plane Aircraft File
Developer by: Laminar Research Category: Data Files Format: Text

Aircraft file used by X-Plane, a realistic flight simulator for pilots and simulator hobbyists; contains data that describes the properties of the aircraft, such as engine power, flight physics, mass properties, and limits.

You can create an ACF file using Plane-Maker, which is a utility that comes with X-Plane. However, Plane-Maker does not enable you to create a 3D model, it is only used to determine the layout of basic aerodynamic shapes and properties of the aircraft. You can use the AC3D application with the X-Plane plugin to create a 3D model in the X-Plane OBJ format.

NOTE: Before version 10 of X-Plane, the ACF file contained aircraft data in binary format. It now contains data in text format.

Programs that open X-Plane Aircraft File
File Type 3 Agent Character Data File
Developer by: Microsoft Category: Data Files

Data file that describes a character created for Microsoft Agent, an interactive animation program; contains character data that can be loaded over the HTTP (or Web) protocol; saved along with a corresponding .ACA file, which contains animation data for the character.

NOTE: Microsoft Agent has been discontinued with the release of Windows 7.

Programs that open Agent Character Data File
Microsoft Agent
Microsoft Agent Character Editor
File Type 4 Adobe Photoshop Custom Filter File
Developer by: Adobe Systems Category: Settings Files Format: Binary

Convolution kernel file created by Adobe Photoshop, an image-editing program; contains a NxN kernel matrix of values used to manipulate the neighboring pixels surrounding a given pixel; can contain positive and negative values as well as mathematical expressions.

Convolution kernel matrixes can be used for blurring, sharpening, embossing, or performing other raster graphic operations to an image; once saved in an ACF file, they can be repeatedly applied to images.

Programs that open Adobe Photoshop Custom Filter File
Adobe Photoshop CC 2019
Adobe Photoshop CC 2019

How to solve problems with ACF files

  • Associate the ACF file extension with the correct application. On :
    Windows: Right click on any ACF file and then click "Open with" > "Choose another app". Now select another program and check the box "Always use this app to open *.ACF files". Mac: Right click (or Ctrl-click) the ACF file, then click "Open with" > "Other...". Then choose another program and check the "Always Open With" box. Linux: Right click on the file, and select "Open with" and choose another program. iPhone: Tap the file. If you do not see an app to open the file, then tap Share "Share" and choose an app. Alternatively, save the file. Then open the Files app Files app. There long-press on the file, then release your finger. You will see a black menu bar. Then tap "Share" and select an app. Android: Tap the Settings icon on your smartphone, then tap on the Apps section. There tap the Options icon in the top right-hand corner of the screen to change the default apps.
  • Update your software that should actually open .ACF is Steam Application Cache File. Because only the current version supports the latest ACF file format. Search, therefore, e.g. on the Valve manufacturer website after an available .ACF is Steam Application Cache File update.
  • To make sure that your ACF file is not corrupted or virus-infected, get the file again and scan it with antivirus software.