> use it like mame e.g. "mess nes smb1" instead of "mess nes -cart > c:\ALL_MY_ROMZZZ\smario1.nes". That makes it easier.
for the record, it is strongly suggested to always specify the media device you want to load, i.e.
"mess nes -cart smb1"
skipping that could lead to misbehaves of the emulator in some corner case, and it is not ensured to work properly as soon as you leave the happy realm of consoles to enter the more complex world of home computers