In WMP go to Options -> File Types und uncheck file extension in question
Go to Control Panel -> Folder options Find extension in question. Click Advanced button and tick Confirm after download checkbox for appropriate action.
>I was trying to download a MIDI file from a web site to my PC. But whenever I enter the url with the file name at the end, the Windows Player would start playing the file. > >I don't want to delete/uninstall the Windows Player but would like to disable it for the time I need to download the file. Since I believe if not for the WP, I would get a dialog asking me if I want to save the file or open it. >