Your question is very unclear. If you're unsure what the .bat file extension is: the .bat file extension stands for bat(ch) and a batch command is a text file that holds a series of commands to be executed in the order they're written in the file. For a very simple example:
Windows executes three statements when you execute this batch file: it turns echo on, executes the .exe file found at <Current Directory>/xmrig.exe, and the pauses the batch file's execution.
What any of this has to do with Bittrex I'm not sure; I'm familiar with their Deposit process and I know you don't need to do anything with batch files to complete a deposit. If you're asking what to do with the Payment_ID and Base Address it gave you (in other words, how to execute the transfer), that is done through simplewallet by using the transfer command as Bittrex describes it to you.