http://bugs.winehq.org/show_bug.cgi?id=59396 --- Comment #4 from Wagner.a18@yahoo.com --- Expected: File opens as a tab in the MDI workspace (same as on Windows, same as with the previous binary from 2025-12). Actual: File opens as a floating MDI child window. Console shows: 0358:err:seh:dispatch_user_callback ignoring exception c0000005 Technical details The exception occurs at eip=77cd57c3 (msvcp140.dll+0x157C3, 32-bit syswow64 version installed via winetricks vcrun2019, dated 2024-08-16). The SEH chain has multiple handlers registered at: 0x01C209CF — Lasal2.exe internal handler 0x792C7018, 0x792C6EF5, 0x792B80B2 — mfc140.dll handlers 0x753B4D30 — vectored handler All handlers return EXCEPTION_EXECUTE_HANDLER (1) — indicating they want to handle the exception. Yet dispatch_user_callback still logs the "ignoring" message and the exception is not handled in user code. Relevant log extract (WINEDEBUG="+seh"): 0358:trace:seh:dispatch_exception code=c0000005 (EXCEPTION_ACCESS_VIOLATION) addr=77CD57C3 0358:trace:seh:dispatch_exception eip=77cd57c3 esp=03b4e0e8 ebp=03b4e10c eflags=00210282 0358:trace:seh:call_vectored_handlers calling handler at 753B4D30 code=c0000005 flags=0 0358:trace:seh:call_vectored_handlers handler at 753B4D30 returned 0 0358:trace:seh:call_seh_handlers calling handler at 01C209CF code=c0000005 flags=0 0358:trace:seh:call_seh_handlers handler at 01C209CF returned 1 0358:trace:seh:call_seh_handlers calling handler at 792C7018 code=c0000005 flags=0 0358:trace:seh:call_seh_handlers handler at 792C7018 returned 1 0358:err:seh:dispatch_user_callback ignoring exception c0000005 Memory layout at time of crash: msvcp140.dll 0x77CC0000 (32-bit, from winetricks vcrun2019) mfc140.dll 0x79000000 (32-bit, from winetricks vcrun2019) ToolkitPro* 0x76DB0000 (Codejock ToolkitPro 24.10 for MSVC 17.0) The same binary works correctly on Windows — all SEH handlers fire, the MDI client is initialized with tabbed document mode, files open as tabs. Regression: Previous build of the same application (binary date 2025-12-17) does not trigger this code path and works correctly under Wine. -- Do not reply to this email, post in Bugzilla using the above URL to reply. You are receiving this mail because: You are watching all bug changes.