Just wondering if you've ever heard this version (http://www.youtube.com/watch?v=SOTlOREAfeU) of the theme, and if so, does anyone know in what version of the game it's used? Something related to Nintendo I assume.

I will listen to it in the evening today,
but additionally WWP has many W:A styled background music.

Sounds like a fan made version of what the song would sound like on a NES/SNES with various graphics from Worms games. If it is from an official game then no doubt Bonz will jump in with the answer.

Sounds like a fan made version of what the song would sound like on a NES/SNES with various graphics from Worms games. If it is from an official game then no doubt Bonz will jump in with the answer.
*Jumping in*
I've watched some YouTube videos of W1 theme songs from several platforms, but it's none of them. They all use the original Worms 1 title music.
It could be a remix from one of the official soundtrack CDs that have been available.

I've dropped Bjørn Lynne a mail.

Heh, that's what I call deeply committed :p

As this song is clearly a version of the WA theme song, it should be very unlikely it was used for any version of Worms 1. What about the WA versions that released on Nintendo consoles?