There is indeed a problem with 7zip and -cart switch.
I just tested a.sfc a.zip a.7z (created with torrent7z)
the first two load fine while the last fails to boot (but it is apparently loaded)
Now if I add that entry to the softlist (a.sfc), then the same 7z archive a.7z is booting fine, of course I don't use the -cart switch then. So I guess there is really a problem with 7zip support and it is unrelated with windows 7z executables.
Report that properly and wait for a fix. For now use raw/zipped files if your roms are not included in the softlist, although using roms which are not included should be avoided if possible.
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