Thanks for the instructions. For what it's worth, the map on my PC was in a zip file, not a cab file. But it's seems pretty clear how to adapt those instructions for this case.
I wasn't able to use those instructions, because every time that I tried to copy the map it failed after a short period of time. I finally concluded that I may have a file system problem, so I reformatted the 140s HD. But that did not solve the problem, because I then found that I still experienced failures when I tried to copy the application back onto the 140s. I ended up powering off/on the 140s, connected to a different USB port on my PC, then I used Home to successfully install the new application and the new map.
After that I found that the 140s did not contain any voices, but again Home seems quite happy to reinstall them.
All in all, it's been a painful coupld days, but everything seems to be working out fine. And thanks to this forum, I didn;t have to contact TomTom technical support!
Thanks!
/Don