First off.. which game? Very important for Holowan since modders here tinker with both K1 and TSL. Otherwise, most ppl will generally assume TSL (since it's the newest out)...
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 I'll be the first to assume it's for TSL ;) 
 Some scripts aren't decompiled unfortunately... 
 While waiting for a response, you may want to try this utility as well. Not only can it decompile (sometimes ;) ) scripts (.ncs).. it contains an archive of already de-compiled scripts (.nss). Yours just might already be in there :)  
http://www.lucasforums.com/showthread.php?s=&threadid=149198) 
 If it's NOT for TSL, I *think* the utility will still work.. but don't quote me :lol: