Since you're on a DOSish system where pipes are only halfheartedly implemented, you'll have trouble any way you try to solve this. I'm not sure Expect will do anything for you. If I'm guessing correctly here, however, you're using this to control an archiver (ARJ by any chance? or am I off by a long shot?), most of which have a commandline switch to automatically confirm any prompts. You might want to look into that.

Makeshifts last the longest.