C:\Users\Steffen>kpsewhich --help
Usage: kpsewhich [OPTION]... [FILENAME]...
Standalone path lookup and expansion for Kpathsea.
The default is to look up each FILENAME in turn and report its
first match (if any) to standard output.
When looking up format (.fmt/.base/.mem) files, it is usually necessary
to also use -engine, or nothing will be returned; in particular,
-engine=/ will return matching format files for any engine.
-all output all matches, one per line.
-debug=NUM set debugging flags.