Using Kawa 1.14.
I have tried opening the directory as a file (because file-exists? reports #t), and using read-line to read the "contents", but it does not work. I get an "Access denied" error.
Looking through the source, I found kawa\lib\files.scm, which defines directory-files.
So, it is just a matter of:
(require <kawa.lib.files>)
(directory-files path)