How to avoid the error:
GpsGatePPC.exe is not a valid Application for Pocket PC
There are two ways to install GpsGate for Pocket PC
Please note that GpsGatePPC.exe i an installation program that you run on your desktop computer to install GpsGate for Pocket PC over ActiveSync.
In the download email you request here:
you get a download link to a CAB file. You either download this CAB file directly to your Pocket PC, or copy it to your Pocket PC using ActiveSync. Then click on the CAB file to install it.
Option 1. does not work on Vista, more info here: