OFN_NOCHANGEDIR flag set.
- GetFileDialog95W: only convert ofn->lpTemplateName if it's a string
  resource id (fixes OpenOffice 1.0 file open dialog crash).
- Ignore OFN_FILEMUSTEXIST flag for save file dialog (fixes save
  dialog in ElstarFormular).
- Rewrote casts that some compilers don't accept.