The score from the film High Tension (aka Haute Tension) is not available for purchase at all because EuropaCorp never produced an official soundtrack, which is a shame because the composer, François Eudes-Chanfrault, isn't getting the attention he deserves. It is not available for download on the net anywhere (or if it is, I haven't found it).
But here, I have created an unofficial High Tension soundtrack with a few pieces of music from the film as well as the songs.
1. Faustina Mauricio Mercedes, Part IV (3:43) 2. "Sara Perche Ti Amo" - Ricchi E Poveri (3:10) 3. "I Believe" - Scott Nickole/Jamie Dunlap/Molly Pasutti/Marc Ferrari; Killer Tracks (3:47) 4. Faustina Mauricio Mercedes (excerpt) (3:17) 5. "Runaway Girl (Just Another Girl)" - U Roy (3:47) 6. Paris Nice (4:05) 7. Celebration A2 (2:57) 8. "A Tout Les Filles" - Didier Barbelivien & Félix Gray (4:15) 9. "Pillow Talk" - Arch Bacon; Killer Tracks (1:33) 10. Out of the Mundial (6:16) 11. "New Born" - Muse (6:05)