help- can't open Kindle .azw

[linux1996]

Hi 4rum.
i use windows 7
I has download a book on Amazon. It is http://www.mediafire.com/?uca4o34nlach91p . But when i use Kindle for PC, i can't reader the ebook. And mesenger :
"The book could not be opened. Please remove the book from your device and redownload it."

When i use "Kindle DRM removal" a windows appear messenger:

Processing Book: Writing Testbenches: Functional Verification of HDL Models, Second Edition
No kindle.info files have not been found.
No K4PC 1.5.X .kinf files have not been found.
No K4PC 1.6.X .kinf files have not been found.

Trying: QPZG32GD

Trying: ocNLpQYF

Trying: H4YOAniU

Trying: u/eLdYEd

Trying: jXJe5XFf

Trying: AAAAAAA*
K4MobiDeDrm v4.0
Error: Decryption Unsucessful; No valid pid found
DRM Removal Failed.

I want help for everybody .Thanks

[alexthunder]

Try to use the latest version of the tools (currently it is 5.1)