The best way to do this is to create a Labview program that uses a dialog box for number entry, then write the number to a text file. Then call this vi from TestStand. To try to do this in TestStand is not practical. In Labview you can check the input to see if it is a valid number, you can prompt for a filename, or check if the file exists, etc... This is what Labview is for. TestStand simply calls a sequence of vi's that do all the action.