Period at the End of the URL (Error)

I'm using IIS 7.5 and whenever a URL has a period at the end, I'm getting an error. I enabled Failed Request Tracing and this is what the log generated:

ModuleName WindowsAuthentication
Notification 2
HttpStatus 404
HttpReason Not Found
HttpSubStatus 0
ErrorCode 0
ConfigExceptionInfo 
Notification AUTHENTICATE_REQUEST
ErrorCode The operation completed successfully. (0x0)

If you want to see the error I'm running into, it can be duplicated at the Microsoft website: http://www.microsoft.com/en/us/default.aspx.

Any ideas?

Thanks!

Brent