The file you need to edit is "mxipupdate_onenote_100.provxml". It is located in the "\SYS\23563\SHARED\COMMON\Office" folder.
I put my office stuff into a MS Apps folder into which there is the "Office Mobile 2010" folder
Mine looks like this:
<wap-provisioningdoc>
<characteristic type="FileOperation">
<!-- ====== -->
<!-- BEGIN ==== Create the needed OneNote Mobile lnk in start-menu -->
<!-- ====== -->
<characteristic type="%CE11%\
Office Mobile 2010" translation="install">
<characteristic type="MakeDir" />
<characteristic type="OneNote Mobile 2010.lnk" translation="install">
<characteristic type="Copy">
<parm name="Source" value="\Windows\OneNoteMobile.lnk" translation="install" />
</characteristic>
</characteristic>
</characteristic>
<!-- ====== -->
<!-- END ==== Create the needed OneNote Mobile lnk in start-menu -->
<!-- ====== -->
<!-- ====== -->
<!-- BEGIN ==== Delete the OneNote Mobile lnk from all possible locations other than start-menu -->
<!-- ====== -->
<characteristic type="%CE11%\OneNote Mobile.lnk" translation="install">
<characteristic type="Delete">
<parm name="ForceDelete"/>
</characteristic>
</characteristic>
<characteristic type="%CE17%\OneNote Mobile.lnk" translation="install">
<characteristic type="Delete">
<parm name="ForceDelete"/>
</characteristic>
</characteristic>
<!-- ====== -->
<!-- END ==== Delete the OneNote Mobile lnk from all possible locations other than start-menu -->
<!-- ====== -->
</characteristic>
</wap-provisioningdoc>