Any good resources out there for writing batch files ? I used DOS around the time WIN3.1 was around, but I've forgotten most of it.

Basically I need to write a batch file that would open up an XLS file (ie. C:\test\blah.xls) everytime the batch file is clicked. And as a bonus, if it can do an "if" statement to check if the XLS is already open, to close it and open it again (fresh copy will be deposited to directory every X minutes).

Thanks!