user.exe: The default dialog button id is 0 on Win16.
[wine] / dlls / win32s16.dll16 /
drwxr-xr-x   ..
-rw-r--r-- 320 Makefile.in
-rw-r--r-- 3859 win32s16.c
-rw-r--r-- 1673 win32s16.dll16.spec