domain.com/directory instead of domain.com/directory/index.html

I installed Apache 1.3.20 on SuSe 7.2. The webserver works fine except, if I want to access A directory on the webserver from a remote browser I can't go to www.domain.com/folder I get a 404 error but if I go to www.domain.com/fodler/index.html it works fine. In the httpd.conf file, I have set the directory Index option to index.html. Another thing if there is no index.html file in the directory and I go to the directory it doesn't show the contents it just gives me an error

>> I can't go to www.domain.com/folder I get a 404 error

When your folder is an alias, you need the trailing slash.

Example:

Alias /folder/ "/non/docroot/path/to/folder/"