Quicktime alternative read-only!?

[Tark]

Well, I'm stumped here. When I silently install the quicktime alternative codec, the GuiRunOnce batch brings up a prompt that the installer is readonly. It offers the chance to ignore this read-only property and then installs fine.

Only problem is that this interaction isn't exactly unattended. Any reason this would happen? This doesn't occur with real alternative. The properties for quicktimealt135.exe aren't marked as read only.

Any ideas here?

Forgot to add the commands I use:

ECHO.
ECHO Installing Quicktime Alternative codec
ECHO Please wait...
start /wait %systemdrive%\Install\codecs\quicktimealt135.exe /VERYSILENT /SP-