How to integrate meld with windows shell?
Solution 1:
There is a workaround:
Open the ‘Send To’ shortcut folder by opening the Run window with WIN + R, and then enter shell:sendto
Within the folder that opens, simply add a shortcut to your Meld executable, e.g. C:\Program Files (x86)\Meld\Meld.exe.
You should now be able to select two files and send them to Meld under the ‘Send To’ submenu of right-click context menu.
https://justinschmitt.com/2019/08/20/meld-right-click-context-menu-merge-files.html
Solution 2:
Here is a SuperUser question about how to add an "Open with" context menu, which will let you open one file with Meld and might just work with two - can you please try it & let us know? If it doesn't, at least you have one opened and will have to manually open the other in Meld (drag & drop ought to make that easy).
See also How to Manually Edit the Right Click Menu in Windows and 10 Best Context Menu Editors for Windows 10.
What I don't know how to do, is what Beyond Compare does and have a "Select left file for compare" menu, which changes to "Compare with <previously selected file name>".
I note that if I select two files Beyond Compare changes the context menu to "Compare" and will load those two files if selected, so this might work with Meld too (if I select more than two files, BC will not add any entry to the context menu).