Files with gil file extension can be found as SGML documents. Probably no longer used format.
There is one other file type using
the GIL file extension!
.gil - GroupMail field mapping data
GIL file extension - GILS document
What is gil file? How to open gil files?
File type specification:
The gil file extension is related to some variant of SGML documents.
Most likely some old format without support from developer. No further information could be found.
MIME types:
application/x-gils
This gil 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.