Dream Theater song

hey i found this song on kazaa and its called lost without you, it sez its by dream theater but every where i look i cant find tabs for it...so im startin to beleive that thas not who its by...if any 1 can help me gimme a yell and ill send ya the song

Biohazard
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Together we ride into the darkness...

I've never heard of Dream Theater doing a song called Lost Without You. Is it a live recording? bootleg? Just because the song is not on any of Dream Theater's albums doesn't mean it's not them. They do a lot of cover songs live, that's why I'm asking if it's a bootleg or a live recording.