It used to be in Windows XP that I could make Warcraft III files load automatically into the game by double clicking on them. This association was made by going to file associations ADVANCED area and using this line:
"C:\Program Files\Warcraft III\War3.exe" -loadfile "%1"
Note that it takes an argument and an option.
However, in Windows 7, the "Default Programs" > "Set Associations" area doesn't seem to have this advanced area.
Can I still get these files to open automatically?