how to open .chm files in ubntu lts 10.04

[Linux Tyro]

hi,

how do i open a file (which I downloaded) and it is the format of like:

filename.chm

It says me that it cannot be opened with document viewer or which
application to select to view?

-- 
Two atoms are walking along. Suddenly, one stops. The other says, "What's
wrong?" "I've lost an electron." "Are you sure?" "I'm positive!"

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