This is Normal behaviour.
The .scpt files can be run from within Script Editor, or From a Applescript Menu.
There are ways to call them from Terminal, but it depends on your version of OS X.

This hint talks about using the code rather than a file in Quicksilver.

What this means is QuickSilver can trigger the code to run, using its own set of keyboard shortcuts.
There are other apps that do this also.

To learn more about Applescript try here : http://applescriptsourcebook.com/
They have AppleScript Tutorials for Beginners and Much more

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mh

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