Using WinMerge to compare Excel files

[bobreil]

Using the amb_xdocdiffplugin I can compare and merge changes in 2 Excel files but can not save changes back in xlxs format. I get the following error:
'Plugin 'amb_xdocdiffPlugin.dll' cannot pack your changes to the right file in 'C:test.xlsx'
The original file will not be changed.

Is saving back to an Excel file not supported?

[christianlist]

No, saving an Excel file is not supported.