Pornopat,
As the others have said... different people have different reasons for requesting the"index.html" page.
"Some" linkslists demand this thinking it gives them better return traffic/seach engine link popularity/a general ego boost..
It is based on the assumtion that the default file in a dir/subdir is "index.html
eg:
http://www.myfukindomain.com/dir/ will actually display
http://www.myfukindomain.com/dir/index.html by default.
This is of course a crock! and can be changed by server setup and/or htaccess
http://www.myfukindomain.com/dir/ may display any number of files as default
http://www.myfukindomain.com/dir/index.html
http://www.myfukindomain.com/dir/index.htm
http://www.myfukindomain.com/dir/index.php
http://www.myfukindomain.com/dir/index.cgi
http://www.myfukindomain.com/dir/blowitoutyourass.html
If these people knew what they were actually talking about they would ask for a recip on the "default index page" not on "index.html" specifically.
Many people class the default index page of a site as your prime "real estate" I would not be giving a link to any link lists that demanded it unless they could show you a benefit for "you" to gain.. not just them
HTH
DD