A 603 file extension is related to the GANZ video compression file format.
603 file extension - GANZ video compression data
What is 603 file? How to open 603 files?
File type specification:
A 603 extension format is a proprietary GANZ video compression file.
It can only be decoded with the GANZ Player and or the GANZ video client associated with the DVR system.
This 603 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.