Ajax file upload error

I'm using the ajax file upload control in ASP 4.0, it works but when uploading that page on the server (ASP 3.5 framework) it gives me the error "Parameter is not valid". What changes do I have to do in the web.config file of 3.5?


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Header to download file that contains semicolon in its filename

php file header download filenames

I already have a PHP code in order to force user download a file,

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