google-musicmanager not installable

I downloaded a deb-file for installing the google musicmanager. I double clicked it. The software center automatically opened and responded with this message: Internal Error! The file ...deb could not be opened. However the deb file can be opened and extracted using the archive manager for gnome. Furthermore, I marked the file as "executable". Therefore, I suspect that this is a bug of the software center.

Regards

Kikl

ProblemType: Bug
DistroRelease: Ubuntu 11.10
Package: software-center 5.0.2ubuntu0.1
ProcVersionSignature: Ubuntu 3.0.0-13.22-generic 3.0.6
Uname: Linux 3.0.0-13-generic i686
ApportVersion: 1.23-0ubuntu4
Architecture: i386
Date: Sun Nov 27 12:12:30 2011
EcryptfsInUse: Yes
PackageArchitecture: all
SourcePackage: software-center
UpgradeStatus: Upgraded to oneiric on 2011-09-26 (61 days ago)