That's a mystery. "Subscript out of range" in this case means that it is not finding a file called "try.xls", so your problem lies there.
Only two things i can think of to see if you can narrow down why it's not working, one, try
or try closing all workbooks, then open the workbook with the macro first, then open the "try.xls" workbook next, then try
see if that makes any diff