Hi,
When the server side use IIS7 ,
both the maxRequestLength and uploader internal code are not able to override the IIS7 30MB configuration.
So if you can't modify that configuration file , we are not able to do more.
When you can upload a file bigger then 30MB in windows ,
I think that because you installed the Silverlight.
In silverlight mode , uploader will spilt the file into multiple pieces, so it works.
Regards
Terry