It's clickteam's own format, and not supported by other applications.
There are a couple of other objects capable of loading .csv files, such as the "dynamic array" object.
Alternatively, you can convert an Excel / OpenOffice spreadsheet to an MMF2 array file using this tool: http://www.create-games.com/download.asp?id=8360
I'm missing the DLLs, msvcp71.dll and msvcr71.dll (which I'm sure aren't hard to find) so I didn't try your app but it did give me the idea to create me own.
I made it specifically to my own needs, but I've uploaded an commented open-source version if anybody would like to experiment with it.