Add a custom command to compare files using WinMerge:
1. Select Options/Preferences/Commands/Add
2. Fill In Description and Custom Command
3. Click Local Command Choice
4. Select Apply to Directories Check Box & Click OK
"C:\Program Files (x86)\WinMerge\WinMergeU.exe" /dr "!@:!/" "!^!" "!"
After adding the custom command, right click on the Command Buttons toolbar and enable display of Command Buttons. The description of the command will be shown on the WinSCP window. Select a local and server file and click on WinMerge to do a comparison.
Note: Till the time the file comparison session is open, the WinSCP session will be locked. So if you find a WinSCP session locked – you know what to do 😉