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This sounds like you've found a bug in either the Rust standard library or the ReactOS API implementation. It might be worth looking into this!

To clarify, it works in 98/Me mode because I added a fallback implementation to Rust9x for these systems, as the flag in question is not supported.

AFAICT it is supported since NT 3.1, though, and it worked fine on all NT-based systems I've tested so far, so my guess would be a ReactOS API bug.

The commit adding the 9x/Me fallback implementation: