Q:

PrimeFaces fileUpload doesn't work on IE<=9

The problem occurs only in IE<=9.  Everywhere else fileupload works perfectly. 
I'm using PrimeFaces version: 3.4.2. 
Upgrading to 4.0 doesn't change anything. 
I've copied code from: PrimeFaces FileUpload demo
<h:form>

            <p:fileUpload fileUploadListener="#{fileUploadBean.listener}"
                mode="advanced" update="messages" auto="true" sizeLimit="100000"
                allowTypes="/(\.|\/)(gif|jpe?g|png)$/" />

            <p:growl id="messages" showDetail="true" />

        </h:form>

I've even defined:
<meta http-equiv="X-UA-Compatible" content="IE=8" />

On my page it's not working but on FileUpload demo page it's suprisingly working. 
I've noticed this strange behaviour on IE <= 9 (Content-Length is 0 and Content-Type is not present - why?): 

But on PrimeFaces page there is (the same browser - IE8/9):

I've also tried to set enctype to multipart/form-data and (like on PrimeFaces demo page) application/x-www-form-urlencoded (which is default)
What can I do to get this to work? 

A:

I've just resolved it. 
The reason why it didn't work was that in the layout - XHTML masterpage there were included jquery and jquery.fileupload... but why IE<=9 didn't handle that I don't know (no errors/warnings in the console). 
I just modified it to that below:
<o:conditionalComment if="gt IE 9">
    <script src="#{request.contextPath}/js/jquery.min.js"></script>
    <script src="#{request.contextPath}/js/jquery-ui.min.js"></script>
    <script src="#{request.contextPath}/js/jquery.fileupload.js"></script>
</o:conditionalComment>

Now it works.