can't install rpm

[Tasica Mabaya]

Hello,

I have an quastion regarding RPM instalation. I'm trying to install tinyos 
on cygwin, and after downloading the neccesary packets I got a message:
bash: rpm: command not found

I I wanted to install rpm, and I found it on 
http://sourceforge.net/projects/cygwin-rpm/ but when I download it I cannot 
open .tar.tar file. I tried to change to .tar.gz but it doesn't work.

Am I on the rght path? Could somebody please help me to install rpm on 
cygwin?

Thank you

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