Thank you very very very very much (no copy pasting !).
This was by far the most effort invested, thought out, informative, clear and practical reply I ever got about perl.

I got the cava (long and painful install but it's over now), and it works (finally).
Not sure how my 45.8KB file became so many MB-s ^^.
It probably includes some unnecessary data, but I can't figure it out yet.
(maybe I'll post this as another question)

But the most important thing is that it finally works (thx again).