i found alittle something that might shed some light:
from website below:
"on your computer unzip the file when you do that you should see another file folder double click that to open, you should now see a cab file with activesync hooked up to your phone open explore from activesync,double click My Windows Mobile Device.If you have a storage card installed drag the cab file there if not I guess you could drag it to your programs folder. Now from your phone go to file explorer search for the cab file wherever you dragged it to, click the cab file and it should automatically start to install itself.You'll be asked where to install it to, I have it installed on my storage card and it works just fine from there for me. Now I'm sure this will be a silly question but you do already have HTC Home Plug installed right?" - sneakyp_86
this link is from at&t wireless website -
http://forums.wireless.att.com/cng/b...hread.id=64911