Photoshop Thumbnail Cache
From Just Solve the File Format Problem
Photoshop Thumbnail Cache refers to a family of thumbnail cache files created by utilities related to Adobe Photoshop, including Photoshop's File Browser, and Adobe Bridge.
Known filenames:
AdobeP8M.md0 AdobeP8T.tb0 AdobeP8P.tb0 Adobe Bridge Cache.bc Adobe Bridge Cache.bct
Identification
Some or all "AdobeP8M.md0" files begin with ASCII "atem".
Some or all "AdobeP8T.tb0" and "Adobe Bridge Cache.bc" files begin with "hcac".
Some or all "AdobeP8P.tb0" and "Adobe Bridge Cache.bct" files begin with "lnbt".
