Files with cbtf extension can be found as font files from Plazmic BlackBerry apps.
CBTF file extension - Plazmic font
What is cbtf file? How to open cbtf files?
File type specification:
The cbtf file extension is used for a font file type found in BlackBerry apps from Plazmic Inc. Typically used in games and other BB apps.
Most likely some old format without support. No further information could be found.
This cbtf file type entry was marked as obsolete and no longer supported file format.
This type of file is no longer actively used and is most likely obsolete. This is typically the case for system files in old operating systems, file types from long discontinued software, or previous versions of certain file types (like documents, projects etc.) that were replaced in higher versions of their original programs.