The .collection file extension is used by Adobe Bridge to reference files. Bridge organizes digital assets without moving them. A collection helps sort images and videos. More details are on the Adobe website. Adobe Bridge displays collection files. The icon shows it is a collection file.
Mac OS uses .collection for font caches. The files store system fonts. Do not open these system files.
To open a .collection file on Windows, right click. Choose “Open with” and pick an app. Check “Always use this app”. On Mac, right click and choose “Other”. Pick an app and check “Always Open With”.
Adobe Bridge handles .collection files. 1 other program supports this file type. See the Adobe site for details on Bridge and .collection files. It also covers the file formats Bridge uses.
Some software for .collection files is Adobe Bridge CC. These files hold references. The data formats are Adobe Bridge Collection File and Font File. .collection files work on Windows and Mac.
Can’t open a .collection file? Windows checks the extension. If Windows knows the extension, it opens the file. If not, you must pick an app. No default app handles .collection files.