the m3 adapters have two dldi files. try them both.
http://chishm.drunkencoders.com/DLDI/downloads/m3sd.dldi
http://chishm.drunkencoders.com/DLDI/downloads/m3sd_alt.dldi
without a proper dldi file you can't read/write to/from the msd card, so you won't be able to load a list of games.
for patching instructions:
http://dldi.drunkencoders.com/index.php?title=Win32_GUI
i would recommend that you run a no-patch on it as well, so the m3 won't try to overwrite it:
http://dldi.drunkencoders.com/index.php?title=DLDI_No-AutoPatch
never patch a patched file. make sure you are only patching a clean copy of the .nds file.
if that fails to work then try a different version of snemulds. make sure your flash kit kernel is up-to-date. you should also try a reformat using the panasonic formatting tools.
-another world