LMDB fails to initialize due to`NtMapViewOfSection` returning `EAccess` error.

Compatibility Report

We're in the process of integrating LMDB (https://github.com/LMDB ) into our game and we're discovering that it fails to initialize under Proton.

System Information

• Proton version: tried on multiple proton versions, including 10.0 and Experimental

I confirm:

• that I haven't found an existing compatibility report for this game.
• that I have checked whether there are updates for my system available.

Symptoms

LMDB internally calls NtMapViewOfSection which is loaded directly from ntdll, but the call reports a permission denied error (EAccess). I'm not sure if it's a proton issue or a wine issue, but I'm not sure where to report wine issues, so I decided to report it here.

Reproduction

Try to open an LMDB environment with a call:

const auto error = mdb_env_open(env.get(), location.c_str(), MDB_NOMETASYNC, 0644)

Observe that it returns permission denied.

Start by reproducing the failure with LMDB's mdb_env_open call under Proton, then trace Wine's handling of the NtMapViewOfSection call and its EAccess result. Done means the LMDB environment opens successfully instead of returning permission denied; no specific source file or test is named in the report.