You say you've "downloaded and installed" but don't specify whether you're referring to a binary (Active State, for ex) or whether you compiled source.
If the former, consider whether you allowed the install to associate the binary with files of type ".pl" in which case there surely should be an entry in the filetypes tab, as least for action "open" (and if so, you may wish to add an action "edit" pointing to your favorite text editor).
Now some scattershooting:
In reply to Re^4: Installing v5.8.4
by ww
in thread Installing v5.8.4
by mohawk1
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