I copied the script from hints.macworld and directed it at "QuickTime Player 7" and it works great. I'm on OS X 10.8.2.
on open filelist
tell application "QuickTime Player 7" to open filelist
run
end open
on run
tell application "QuickTime Player 7"
set ratio to 4 / 3
tell application "Finder" to set display_bounds to bounds of window of desktop
set display_width to (item 3 of display_bounds)
set display_height to (item 4 of display_bounds) - 42 -- menu height + title bar
set window_count to count of windows
set max_pixels to 0
repeat with potential_cols from 1 to window_count -- try all possibilities - hardly optimal but who cares.
set potential_rows to round (window_count - 1) / potential_cols + 1 rounding toward zero
set {potential_window_width, potential_window_height} to {round display_width / potential_cols rounding toward zero, round display_height / potential_rows rounding toward zero}
if potential_window_width / potential_window_height < ratio then
set {potential_window_width, potential_window_height} to {potential_window_width, round potential_window_width / ratio rounding toward zero}
else
set {potential_window_width, potential_window_height} to {potential_window_height * ratio, potential_window_height}
end if
set used_pixels to potential_window_width * potential_window_height * window_count
if used_pixels > max_pixels then
set {window_width, window_height, cols, rows} to {potential_window_width, potential_window_height, potential_cols, potential_rows}
set max_pixels to used_pixels
end if
end repeat
set {x, y} to {0, 0}
set wins to (get every window)
repeat with win in wins
set doc to document of win
set controller type of doc to none
set looping of doc to true
set {wi, hi} to natural dimensions of doc
if wi / window_width > hi / window_height then
set dimensions of doc to {window_width, hi / (wi / window_width)}
else
set dimensions of doc to {wi / (hi / window_height), window_height}
end if
set x to x + 1
if x = cols then set {x, y} to {0, y + 1}
end repeat
set {x, y} to {0, 0}
set wins to (get every window)
repeat with win in wins
set {wi, hi} to natural dimensions of doc
if wi / window_width > hi / window_height then
set bounds of win to {window_width * x, 22 + window_height * y, window_width * x + window_width, 22 + window_height * y + hi / (wi / window_width)}
else
set bounds of win to {window_width * x, 22 + window_height * y, window_width * x + wi / (hi / window_height), 22 + window_height * y + window_height}
end if
set x to x + 1
if x = cols then set {x, y} to {0, y + 1}
end repeat
set wins to (get every window)
repeat with win in wins
play document of win
end repeat
activate
end tell
end run