Access denied when trying to walk web directory but have no problem accessing a file inside this same directory

[Thunderstone]

When I try to walk an subdirectoy on a remote server, I get an access denied
message, no doubt because I don't have permission to access that directory
on the remote server.

However, I know the names of some of the files inside this directory and can
access them via a web browser with no problems. Is there any way I can
bypass the 'access denied' problem I'm running into at the directory level
and index all the files inside this directory (I only know the names of a
few of the files inside the directory)?

[Thunderstone]

Webinator doesn't know any more about a site than any other web user.
It gets urls from what the server provides or from what you provide.
It can't step around security settings.