Files with the BCT extension are used by the file manager for Adobe Creative Cloud service called Adobe Bridge. BCT files are used to store the cache used by the program. It is a cashe file. It contains thumbnails of photos that have been viewed. Such data allows for quick access to information about the photo. BCT files are created together with BC files. These two types of files can be deleted by the user, but will be regenerated the next time they open Adobe Bridge.

Adobe Creative Cloud and Adobe Bridge are solutions from Adobe Systems Incorporated.