RHEL 5 running vmware tools seen as Other Linux 2.6

Hi guys,

Why when I start  my VM ( Guest OS running RHEL5 / or Debian 5 ) since vmware-tools has started the "Guest OS" in VI Client change from RHEL5 32bitsto Other Kernel 2.6 32Bits ?

Using up-to-date vSphere and laster tools ( it's the same when usin open-vm-tools ) .

Thanks