Some of the library files installed by media-libs/win32codecs-20050115 have permissions 640, meaning only root and users in group "root" can read them. This is how they come in the tarball, but playing videos as root is not generally a good idea, so the ebuild should probably install them all with 644.
Created attachment 52063 [details, diff] patch to fix permissions and ownership of win32codecs Not only does this use the helper scripts to install all the libraries with 755 permissions, but it also avoids the annoying "x was installed with group portage" error messages.
fixed for the new version. thanks