Why not get away from the old fashioned batch files, and use a simple SSIS package? That would be so much more simple, more efficient and much more secure. And everything would be nicely contained in the MSDB database. You can do so much more in the package, like checking to see if your source file actually exists before processing, moving the file to another directory after the processing is complete, or just deleting the file if you do not want to keep it. And you can easily schedule the package to fire off when needed.

Andrew SQLDBA