you mean .azw not .azm
Omar, I don't understand why you're not reading the manual from the Kindle itself. Your post doesn't mention having problems with the device itself, but that you're having trouble opening the manual ebook file from your computer. *scratches head*
You
can use Kindle4PC, but you don't have to. if you use Kindle 4 PC, you have to register it, and Amazon's website treats it like a second Kindle... If all you need to do is read an .azw, .mobi or .prc file from your computer, you can use
Kindle Previewer.