Do you have a good idea or know some CPAN's module to achieve the aim ?
Its microsoft product, so microsoft must have something to convert to html, so just use that.
or
http://en.wikipedia.org/wiki/Report_Definition_Language is xml, so xml it up buddy :D
or
Here's another one, search for a product, you might find one like http://www.codeproject.com/KB/database/rdlproject.aspx
RdlViewer.dll
Provides a .NET control for embedding in .NET applications. Displays RDL reports, and provides methods for printing and saving to HTML, PDF, and XML.