Need to make a .wma or a .mp3 file a MIDI one.
Who know how can I do that?
 
         > Iszil

Simple - you can't!
The problem is that the data recorded in WAV, WMA, MP3 etc is a digital sample of soundwaves - midi is only a way of triggering a sound that needs to be created by a sound source (such as a keyboard or midi soundcard).  There is no way of extracting all of the various sounds into their separate components, and then digitally converting them to midi.    I believe there are digital processors that are able to track individual notes - and of course there are midi guitars.
But, as yet, there is no way to change real audio into midi.

............ unless anyone knows any better - I may be a few years behind.  Somehow, I can't see it being possible for a long, long time - if ever!

Sorry Iszil

jims right

dont know whether it works. but take a look at this...

I googled with "convert wav midi" and this is the first result

http://www.intelliscore.net/

Don't listen to them, it can be done!!

Search for a little program called Composer. All you do is record something and it then convers the sound waves into MIDI notes. It doesn't work perfectly for, say, complete songs, but it can be useful to record riffs and stuff.