On Win7x64, this script overrides the default Win+R behavior and places the Run dialog panel at center screen.

Anyone want to comment on what it does on WinXP, Win8, Vista?

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#R::

Run, c:\WINDOWS\system32\rundll32.exe shell32.dll`,#61

winwaitactive, Run

WinGetPos,,,WinWidth, WinHeight, A

WinMove, A,,% A_ScreenWidth/2 - WinWidth/2,% A_ScreenHeight/2 - WinHeight/2

Return

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I like this way better than having Run appear at the lower left corner.