A uris file extension is related to the experimental file format that contains list of Uniform Resource Identifiers.
URIS file extension - Uniform Resource Identifiers
What is uris file? How to open uris files?
File type specification:
The uris file extension is associated with an experimental file format that contains list of Uniform Resource Identifiers. It was probably never used practically.
Most likely some old format without support. No further information could be found.
Mime types:
text/uri-list
This uris 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.