I have a problem with Apache and FrontPage extensions. I can open the root Web, but when I try to open a per-user Web I get an error. Example: http://host/˜user where user is public_html. Is this a problem with Apache?

You need to confirm that the ˜user/public_html directory, in your Apache configuration files, is set to AllowOverride All. Like this:

           
   AllowOverride All