vst instrument

[quote]I've made a vst instrument in max msp 4.6[/quote]

hmmm, interesting, in that this is not *directly* possible in max msp.

What you made is a pluggo instr., or a standalone instr., not a vsti per se. Pluggos can be used as vsti (or au on mac), but the users will have to download the 4.6 pluggo runtime to use it in their DAWs, and Ableton Live 8 will not work with pluggo at all. Also, pay attention to the info about third party objects used in the pluggo or compiled app build!
if you wish a standalone compiled app:
You can save it as a collection/application (*not* vsti): this would mean all the user would have to have is the free max 4.6 runtime;
As long as the patch uses only standard max 4.6 objects, you will only have to use the menu to save as app. otherwise, you have to make sure your build has all third party object included in the build, by manually adding them to build. Really quite simple, although i didn't say very well, i hope you can decipher what I mean, ;-).
g'luck
cfb aka j2k