LanguageTHMB
Thumbnail data
File type: Bitmap image file
Files with thmb file extension are mostly thumbnail previews or larger images.
What is thmb file?
File type category:
Bitmap image file
Date updated: January 25, 2018
The thmb file extension is reported to be used for some sort of thumbnail files. Might have been used in some older programs especially on Mac platform. Also could be a typo for the ITHMB file.