aspnet command line tools location
<p>Microsoft provides a number of command line tools for working with asp.net applications.  I haven't had any trouble using these tools.  One thing that I can not understand though, is the location of these tools.</p>

<p>Even for applications targeting newer versions of .net, these tools are located in the .net v2 directory.  On my machine, that's <code>C:\WINDOWS\Microsoft.NET\Framework\v2.0.50727</code>.  Why do these tools not exist in the <code>v3.0</code> or <code>v3.5</code> directories?  And why do the ones in the older directory work on the newer framework?</p>

<p>This is more of an idle curiosity than required knowledge for me, but I would like to know.</p>

<h2>Update:</h2>

<p>Thanks for the good answers everyone.  These answers raise a new question though.  I hope you will forgive me for asking it here, since it is so highly related.  If .net 3.5 is really just using the CLR from 2.0, why is 2.0 compatible with Windows 2000, but not 3.5?  It would seem to me that if the updates in 3.0 and 3.5 run inside the framework of the earlier version, then they must maintain compatibility with the same platforms as the earlier version too.  Why is this wrong?</p>
