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[But MapManager on a Mac will not allow the gmapsupp.img file to be selected for opening.]

Hello all,

I have performed many searches and called Garmin tech support several times, but I can't seem to get an answer. In the interest of being complete:

I recently purchased a new 60CSx.
I bought a 4 GB Kingston card and put it in the 60CSx.
I purchased the DOWNLOAD of City Navigator North America NT. (new maps, not an update).
(I own no PCs, so everything here is on a Mac.)
I logged in to my.garmin.com and attempted to download the maps I bought.
I was required to download and install the Communicator Plug-in.  Done successfully.
Now my.garmin.com tells me that the card must be in the GPS receiver.  There is no option to download to an SD card.  (In fact, there is a mouseover message that says if you want it on a different SD card, then put it in the receiver).
I let the download run and sure enough, I ended up with a Garmin folder on the SD card with a gmapsupp.img file in it @ 1.42GB.  (By the way, I called Garmin tech support.  They say it's not possible to install the map directly to the GPSr - that's what MapInstall is for.)
The 60CSx appers to now have the City Nav NT maps on it....
I took the card out of the unit and copied the gmapsupp.img file to my computer.
I opened MapManager hoping to install the maps on my Mac to use BaseCamp or RoadTrip.

But MapManager on a Mac will not allow the gmapsupp.img file to be selected for opening.  I thought it may have something to do with the card, so I tried opening the copy on the card while plugged into a card reader.  Same result.  The file is grayed out in the "Open..." dialog of MapManager and will simply not allow it to be selected.

Meanwhile, MapInstaller tells me I have no maps installed on this computer.

Am I missing something? How can I install the City Navigator North America NT maps that I have purchased onto my Mac to use with BaseCamp and Road Trip?  Is the IMG format the wrong format?    I have read in other places that a Mac expects a *.gmap file.  Do I have a further step?

I'm not looking to hack anything of Garmin's - I'm honestly just trying to be a good customer and use their product that I've paid for.  I have crawled their entire web site looking at all their documentation.

I know you guys get these kinds of questions a lot and I have done extensive searching through the forums looking for an answer, but have not seen this particular scenario plaguing anyone else.  I'm praying it's something trivial I'm doing wrong. 

Thank you in advance.

Cory