cant install token

got an email with this xxx.sdtid file attached.
When clicking it it always opens a viewer. RSA SecurID Software in installed but wont open.
When tap and hold it displays RSA SecurID but when selecting this nothing hapens.

Using iPhone 3GS and IOS 6 software is not useable!

Bernhard234 about RSA Authenticator (SecurID), v1.3