https://bugs.winehq.org/show_bug.cgi?id=50771
--- Comment #3 from Joel Holdsworth joel@airwebreathe.org.uk --- The man page doesn't sound very promising:
The argument flags must include one of the following access modes: O_RDONLY, O_WRONLY, or O_RDWR. These request opening the file read-only, write-only, or read/write, respectively.