User agent?

[CTho9305]

What is the .net clr part of this? I've never seen it before.

Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; .NET CLR 1.0.3705)

 

[Nothinman]

It must be added with you install the .NET run times, possibly as a way for MS to determine if you have them installed or not for web services that'll use them.