Takashi Sawanaka

Well, actually, WinMerge isn't lying and actually writes to a temporary file %TEMP%\WinMerge_TEMP_xxxx\patxxxx.tmp. This is useful if the "Open to external editor" option is checked, but may not make sense...

Wouldn't it be better to use IrfanView or FastStone Image Viewer which supports Slideshow?

WinMerge's automatic merging determines the common ancestor depending on the currently active pane, see the link below. https://github.com/WinMerge/winmerge/discussions/1156#discussioncomment-2029750

You may have an older 32-bit version of WinMerge installed (C:/Program Files(x86)/WinMerge) or the WinMerge executable file may be stored in another folder.

Was version 2.16.40 of WinMerge the 32-bit version (C:\Program Files(x86)\WinMerge)? Normally, if you have an older 64-bit version of WinMerge installed and you install a newer 64-bit version of WinMerge,...

Could you please attach the settings in the Compare/General category of the Options dialog, or the settings that appear when you select the Help → Configuration menu item? Also, could...

Unfortunately, even if you attach a file to a reply email from GitHub, it will not be reflected in the GitHub issue. I was not able to see your attachment....

The CompareMSExcelFiles Settings dialog is displayed using an outdated component called mshta.exe. mshta.exe is located in the following paths, but do these files exist? `C:\Windows\System32\mshta.exe` `C:\Windows\SysWOW64\mshta.exe` Also, is there a...

How you view logs depends on the security software you are using. Alternatively, if it's logged in the Event Log, you may find crashes of mshta.exe under the Application category...

That's very strange... - The CompareMSExcelFiles plugin just doesn't show the Settings dialog, but is it possible to extract and compare files? - Could you please extract the attached testplugin.zip,...