advpack/tests: Don't hardcode the windows directory.
[wine] / dlls / advpack /
drwxr-xr-x   ..
-rw-r--r-- 361 Makefile.in
-rw-r--r-- 30565 advpack.c
-rw-r--r-- 4420 advpack.spec
-rw-r--r-- 1140 advpack_private.h
-rw-r--r-- 32689 files.c
-rw-r--r-- 29057 install.c
-rw-r--r-- 13271 reg.c
drwxr-xr-x - tests