https://bugs.winehq.org/show_bug.cgi?id=50778 --- Comment #2 from Alex Folland <lexlexlex(a)gmail.com> --- Your comment and Fabian's comment in the bug report you linked pointed me in the right direction for a personal-use workaround. I have an updated copy of Windows 7 64-bit from which I can use system DLLs. I copied the following DLLs from my Windows drive to ~/.wine/drive_c/windows/system32/ and renamed them to lower-case versions, then set them to be used as overrides in winecfg: -C:\Windows\System32\UIRibbon.dll -C:\Windows\System32\UIRibbonRes.dll -C:\Windows\System32\uxtheme.dll -C:\Windows\System32\propsys.dll Once this was done, TortoiseMerge opened in wine without any apparent issues. This workaround involves using proprietary non-free DLLs, so it's not a permanent solution for everyone, but it works for my personal usage. -- 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.