New subject: [Bug 58476] Specifying RRF_RT_REG_SZ | RRF_RT_REG_EXPAND_SZ in dwFlags when calling RegGetValueW fails

8 Jul 2025


      http://bugs.winehq.org/show_bug.cgi?id=58476
Bug ID: 58476
           Summary: Specifying RRF_RT_REG_SZ | RRF_RT_REG_EXPAND_SZ in
                    dwFlags when calling RegGetValueW fails
           Product: Wine
           Version: unspecified
          Hardware: x86-64
                OS: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: P2
         Component: kernel32
          Assignee: wine-bugs@winehq.org
          Reporter: daniel@oneill.app
      Distribution: ---
Created attachment 78927
  --> http://bugs.winehq.org/attachment.cgi?id=78927
regget_test.c
A call to RegGetValueW with dwFlags set to RRF_RT_REG_SZ | RRF_RT_REG_EXPAND_SZ
 results in ERROR_INVALID_PARAMETER (82) instead of success. The observed
behaviour on Windows is a successful call, provided the dwType of the record is
in dwFlags.
Wine Version:
wine gitlab master (25-07-08, 32c6c407c52afd571edf7e17cd89d82d624ea95c)
Expected Behaviour:
A successful call with populated pvData/pcbData
Observed Behaviour:
Call returns ERROR_INVALID_PARAMETER
Notes:
This affects R.E.A.L VR mod for various games.
Code demonstrating issue is and a proposed patch attached.
Registry key to test:
"HKEY_LOCAL_MACHINE\SOFTWARE\Khronos\OpenXR\1"
Demonstration code looks for a RRF_RT_REG_SZ | RRF_RT_REG_EXPAND_SZ named
"ActiveRuntime"
Build command for provided demonstration code:
winegcc -mconsole -target x86_64-w64-mingw32 -o regget_test.exe regget_test.c
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[Bug 58476] New: Specifying RRF_RT_REG_SZ | RRF_RT_REG_EXPAND_SZ in dwFlags when calling RegGetValueW fails