A 300 file extension is related to the NCBridge network boot software for XP/NC200/NC400/NC900 computers.
300 file extension - NCBridge network boot software data
What is 300 file? How to open 300 files?
File type specification:
The 300 file extension is associated with the NCBridge software.
NCBridge is used to booting and running XP/NC200/NC400/NC900 series network computers.
The 300 file stores network boot software data used by NCBridge for its internal purposes.
This 300 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.