Voici quelques solutions. J'ai trouvé la mienne au support Microsoft (désinstall du codec mp3 + réinstall à partir du cd du jeu).
http://support.microsoft.com/default.aspx?scid=kb;en-us;814549
ou
Please follow these steps if some sounds and
speech are still missing after installation:
. Uninstall any 3rd party codec pack or the Nimo
Codec pack from your system.
. Uninstall Freelancer.
. Go to the following directory,
C:\WINDOWS\system32 and delete the
file "l3codecp.acm". If there happens to be another
file named "l3codeca.acm", delete this too.
. If your system is Windows 98 or ME, open the
system.ini file located in your system folder;
C:\WINDOWS\SYSTEM. Delete ONLY the line that starts
with "msacm.l3acm=". In the case of the Nimo codec pack,
this will read "msacm.l3acm=l3codecp.acm"
. If your system is Windows 2000 or XP, open the
system registry editor (regedit) from the RUN command
window.
. Locate and delete the following key:
\HKLM\SOFTWARE\Microsoft\WindowsNT\CurrentVersion\Drivers3
2\msacm.l3acm
. Load the Freelancer installation CD and locate
the REDIST folder. Within the REDIST folder, double
click on the file named "WMFADist.exe" and follow on-
screen instructions.
. Install Freelancer.
ou
1. To download the l3codecp.acm codec click:
http://tinyurl.com/7nta
or copy the l3codeca.acm codec from your windows system32 folder
to the Freelancer\EXE folder in step 2, and rename it to l3codecp.acm.
2. Save the codec to your Freelancer EXE directory. The path is:
Program Files\Microsoft Games\Freelancer\EXE
3. Reboot