http://bugs.winehq.org/show_bug.cgi?id=14930
--- Comment #27 from Javier Kohen jkohen@users.sourceforge.net 2009-08-09 07:53:14 --- Created an attachment (id=22923) --> (http://bugs.winehq.org/attachment.cgi?id=22923) +cabinet log of failed .NET 2.0 (dotnet20) installation
Tried to install dotnet20 with winetricks and by manual execution of the installer. If I'm not wrong, the failure is the same reported by the OP.
I'm using wine 1.1.27.