Running Scripts from a BAT file?

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.