I'm currently trying to join my locally-hosted ROBLOX server from a BAT file. (I'm using the 2008 client.)
My current file looks like this:
@echo on
RobloxApp.exe -script loadfile("data/JoinLocalHost.txt")
I'm sure i'm doing something wrong, since when i run the file, I see roblox open for a half-second, and then the window closes.