On Win 7 x64, with WinMerge 18.104.22.168 Unicode (default install), with 7-zip installed from 7z465.exe (obtained from 7-zip downloads web page), diff two folders then select a file from the list of diffs and right-click Zip | Right... On first try, it will work: a file browse dialog will open, click Cancel. Now try it a second time: this time WinMerge doesn't open the file browse dialog but instead shows the error "encountered an improper argument". If you close winmerge and restart it and try again it will work first time, then fail for all subsequent tries, until you restart winmerge.
I tried using the archive capability with latest 7-Zip (9.2 x64 build) but winmerge does not recognized that one (the Help | Archive Not Supported item is visible).
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