An yz file extension is related to the YAC compressed format. An yz file stores archive.
YZ file extension - YAC compressed archive
What is yz file? How to open yz files?
File type specification:
The yc file extension is used for archives compressed with YAC (Yet Another Compressor) - a file compression program developed for DOS.
It uses an improved version of the LZ+Huffman compression algorithm.
This yz 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.