Hello, Georges!
You wrote  on Fri, 1 Sep 2006 14:03:46 +0200:

GB> When installing my app on a client system, I want to setup all dlls
GB> used by my app in a separate folder, in order to keep my installation
GB> folder cleaner.

GB> I guess I'll  have to do something in the .config file. How does that
GB> works?

Yes, you have to tell the CLR where to look for your assemblies.
Keyword here is "probing".
( http://msdn2.microsoft.com/en-us/library/15hyw9x3.aspx )

If folder, where you put your asseblies is "bin", or "bin2" then config file
look like

<configuration>
   <runtime>
       <assemblyBinding xmlns="urn:schemas-microsoft-com:asm.v1">
           <probing privatePath="bin;bin2;"/>
       </assemblyBinding>
   </runtime>
</configuration>

--
Regards, Vadym Stetsyak.
Blog: http://vadmyst.blogspot.com