click button to save file - opens up save window...

[cityofsalisburync]

I'm creating a project using AMS 5.0.5.0 that will contain 2 videos - one low quality version that the user will click on a button to open and play, and a second, higher quality video that when a button is clicked, I'd like a save window to open so the user can select where the file is to be saved. I can't seem to find that option, only to manually specify in the button properties where to save it. Is it possible to do this? Thanks for any help.