Save file just created in QuickTime, How???

Question

I create new file (AAC, audio) in QuickTime by paste some tracks into one QT-document. Then I need to save this new soundtrack. I do following:
tell application "QuickTime Player"
tell application "Finder"
set the temp_folder to (make new folder at desktop with properties {name:"_JoinToAudiobookTempfolder_"}) as alias
end tell
set the new_file to ((temp_folder as text) & "temp_file")
(* Some Code *)
save movie 1 given «class dfil»:file new_file, «class savk»:self contained
end tell
But QT doesn't save file on folder "_JoinToAudiobookTempfolder_" on Desktop! It shows windows "Save File As" and wait that I specify location and file name! Why?

Answer 1

I understand. So, I decided to change the order of
processing :-)) At first I'll join mp3's in QT, and
than convert created track into AAC using iTunes.
You can do that, but if you can do everything with QT, then why bother with iTunes?
Another question - i don't want quicktime to show
"Welcome Movie". So, i need to disable this feature
or temporary turn it off. I tried use this:
tell application "QuickTime Player"
set show welcome movie automatically to false
end tell
But this not works. So, ... how?
show welcome movie automatically is a read-only property, so you can not set it.
You can disable it in QT's Preferences --> Show Content Guide automatically
PS. That too bad that applescript application's
library doesnot contain live examples.....
No you don't want that. Things will get bloated.