Batch File

You could create the batch file that has a call to Notepad with your filename. eg:

Notepad C:\MyFile.txt

(Don't forget to put the filename in double quotes - "C:My File.txt" - if there's a space in the name)

Or you could create a batchfile which will accept a parameter, and open the file supplied:

Notepad %1

And call that with something like

MyBatchFile "C:\MyFile.txt"

Not quite sure what all this has to do with SQL Server, though!