An 13o file extension is related to the Receiver Independent Exchange Format.
13O file extension - RINEX data
What is 13o file? How to open 13o files?
File type specification:
The 13o file extension is associated with the RINEX (Receiver Independent Exchange Format), an exchange format used to interchange and store RAW satellite navigation data.
The 13o file stores data in RINEX format.
This 13o 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.