The File Extensions Database

.ACO File Extension

  • Developer by: Adobe Systems
  • Category: Settings Files
  • Format: Binary

What is an .ACO file?

.ACO is Adobe Photoshop Color Swatch File

An ACO file is a color file used by Adobe Photoshop, a raster graphics editing program. It stores a color swatch, which is a collection of predefined colors, along with the name of each color, which is displayed when hovering the mouse over the color in the color palette. ACO files are used for creating images that conform to certain color standards.

ACO files are useful for controlling colors for different publishing media, such as digital image files and paper prints. Several color swatch files are included with the Adobe Photoshop installation in the /Presets/Color Swatches/ directory, which include colors for the ANPA, FOCOLTONE, HKS, PANTONE, TOYO, and TRUMATCH standards.

Programs that open Adobe Photoshop Color Swatch File
Adobe Photoshop CC 2019
Adobe Photoshop CC 2019
ACO File Viewer

How to solve problems with ACO files

  • Associate the ACO file extension with the correct application. On :
    Windows: Right click on any ACO file and then click "Open with" > "Choose another app". Now select another program and check the box "Always use this app to open *.ACO files". Mac: Right click (or Ctrl-click) the ACO 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 .ACO is Adobe Photoshop Color Swatch File. Because only the current version supports the latest ACO file format. Search, therefore, e.g. on the Adobe Systems manufacturer website after an available .ACO is Adobe Photoshop Color Swatch File update.
  • To make sure that your ACO file is not corrupted or virus-infected, get the file again and scan it with antivirus software.