A subs file extension is related to the AvantGo a data sync service.
SUBS file extension - AvantGo data
What is subs file? How to open subs files?
File type specification:
The subs file extension is associated with the AvantGo, a software for a Web page and file synchronization service for smart devices and PDAs.
The subs file stores data for AvantGo.
AvantGo was shut down in 2009.
This subs 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.