I was surprised to find this image format wasn't supported by default in the Windows viewer. I did a Google search for freeware TGA viewers and didn't take long to find one.
http://www.fine-view.com
Download size is under 2 Megs.
The author is Japanese and there's no English documentation to speak of but it's pretty self explanatory to use, so this isn't a problem. Also does file conversions for you. The 1024x768x24 TGA screenshots are surprisingly big, in the multi-megabyte range, but a JPEG conversion cuts them down to under 200kB.
No doubt the rest of you have found something similar long ago but I thought I'd post this here in case anyone equally new to MTW was also looking for a screenshot viewer utility.
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