How do I configure my web browser to launch Mathematica 2.2 when downloading notebooks?

You should consult the documentation for configuring your web browser to accept different MIME types. The naming convention for Mathematica and MathReader 2.2 notebooks is to end the name with extension .ma. The MIME type for .nb should be set to application and the subtype set to mathematica.

In Mathematica for Windows, NeXT, and X, each notebook consists of a text file with a name of the form .ma and a binary file with a name of the form .mb. In most cases, you do not need to transmit the .mb file. For additional information, see the following FAQ.

http://support.wolfram.com/mathematica/reference/web/notebookfilemb.html

Configuring a web browser solves only half of the problem. A web server also needs to have the MIME type set correctly. For more information, read the following web page that describes how to configure your web server to server Mathematica and MathReader notebooks.

http://support.wolfram.com/mathematica/reference/web/configurewebserver22.html

Questions or comments? Send email to support@wolfram.com.