How to extract filename.tar.gz file

Question

I want to extract an archive named filename.tar.gz.

Using tar -xzvf filename.tar.gz doesn\'t extract the file. it is gives this error:

Answer 1

I have the same error the result of command :

file hadoop-2.7.2.tar.gz

is hadoop-2.7.2.tar.gz: HTML document, ASCII text

the reason that the file is not gzip format due to problem in download or other.