Sorry,
At first, I am using Code gear installAware Express 7 r2 in this version 'MSIcode' is blocked.
I want to set Access Control to have read/write access to some files.
In edit tip balloon is the advise, 'if this command having no effect, just move this command after Apply install in your MSIcode'.
In my version IAE MSIcode does not work.
My question was
Is the method to set Access Control in my version of IAE7 in spite of that 'MSIcode' is blocked.
You can edit the Access Control from the Design view in InstallAware (it was not clear from your post whether you already did so).
Otherwise, there is no option to further tweak the command such as placing it after Apply Install.