How to open Adobe Photoshop color palette and swatches data .aco files
Have you had trouble opening the aco file on your computer? What are aco files? We explain what they are and recommend software that we know will open them.
What is aco file?
Files with aco extension are quite often color palettes and swatches from Adobe Photoshop graphics editing tool.
Adobe Photoshop color palette and swatches data description
File extension aco is associated with the Adobe Photoshop professional pixel-based graphics editing software for Windows and Mac.
A typical .aco file contains color swatch (collection of predefined colors) that are viewed in the Photoshop color palette.
Suggested software to open aco file

Adobe Photoshop
One of the best bitmap graphic editing program

Adobe Creative Cloud
Latest, subscription based productivity suite from Adobe

Adobe Photoshop for Mac
Mac version of popular digital image editor
There are other ACO filename extensions with the same .aco suffix
aco - ArCon object collection data
Files with aco file extension can be found as projects from ArcCon planing and designing software.
aco - CYANA dihedral angle constraint
An aco file extension is associated with the CYANA program. An aco file stores dihedral angle constraint.