What is a html generation class in UIX?

There's a site which is used OAF.
But some pages are not rendered well.
The problem is caused by "<oa:messageFileUpload>" tag in XML file.
PC browser renders it properly, but ie mobile 5 couldn't render it well.
However in html source, it is showed as "<input type=file>" tag, and this html tag can be rendered in ie mobile.
So maybe UIX has some problems in a part of html code generation.
I want to modify and apply it.
Someone can help or advise me?

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