The file skypeforpocketpc.cab is not a valid windows ce setup file

I have an iPaq running Windows Mobile 2003 SE. The above error was something I’ve seen when I tried installing SkyPE for PocketPC on it. It appears that SkyPE have decided to sign cab files, according to some new (and pretty unexplained) concept of MS, disregarding any existing non-WinXP or non-ActiveSync4.2 users (and I am…