Files with cache-1 file extension might be found as font caches generated by some Perl programs.
CACHE-1 file extension - Perl font cache
What is cache-1 file? How to open cache-1 files?
File type specification:
The cache-1 file extension is related to a special cache file from Perl. Typically found as .font.cache-1, but only the last part is the actual extension. Generated by some Perl programs.
This cache-1 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.