Compare result of RegQueryValueExW() with ERROR_SUCCESS.
[wine] / dlls / unicows /
drwxr-xr-x   ..
-rw-r--r-- 42 .cvsignore
-rw-r--r-- 352 Makefile.in
-rw-r--r-- 12603 main.c
-rw-r--r-- 22509 unicows.spec