Sorry arg0.

System (codecs) works fine playing the mp3.

Players (Winamp, WM, VLC) works fine playing the mp3.

The MP3 file (all the MP3 files of affected users) are MP3, not WMA.

But.. mIRC can't play these MP3 for affected users. It works if the file are renamed to .wma (not converting MP3 to WMA, only renaming). Its absurd, but its REAL, and how its real, I tell you.

So, where is the problem ? In the system that works correctly? no. In the codecs that works correctly? No. In the players that works correctly? No.

I think its not exactly a mIRC bug, because mIRC plays the MP3 correctly in the most systems. But some users have this problem, and I have no idea why. I think the problem is the way of mIRC reads the header. When its renamed to .wma or .wav works, but with .mp3 not.
For me its very difficult to find the error because my system it's no affected and I have no idea how reproduce the bug. So I made test with users, installing codecs, renaming files, sending files, etc. and I have no solution.