tell application "Finder"
set PrefsFolderPath to the preferences folder as string
set AppSwitcherPrefsPath to (PrefsFolderPath & PrefsFileName)
set AppSwitcherPrefsFile to AppSwitcherPrefsPath as alias
move AppSwitcherPrefsFile to the trash
end tell

if AppSwitcherIsVisible then
tell application "アプリケーション切替"
set the visible of the palette to true
end tell
end if

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たぶんこれだと思う。