Do you want to access a file on your local machine?
I don't know whether that is the right way to do it. However, if the file path/file is in your document/database you can use something like this. I used the Xpage "link" element itself but still href should work.
<xp:viewColumn columnName="$92" id="viewColumn10" value="">
<xp:link escape="true" id="link1">
<xp:this.text><![CDATA[#{javascript:viewEntry.getColumnValue("$92");}]]></xp:this.text>
<xp:eventHandler event="onclick"
submit="false">
<xp:this.script><![CDATA[var docid='#{javascript:viewEntry.getColumnValue("$96")}';
var link="";
var typ='#{javascript:viewEntry.getColumnValue("aTyp")}';
link='xx_openPage.xsp?aTyp='+typ+'&action=openDocument&documentId='+docid;
window.open(link,'New','width=1000, height=650, left=250px, top=250px, menubar=no, resizable=0, scrollbars=yes');
]]></xp:this.script>
</xp:eventHandler>
</xp:link>
<xp:viewColumnHeader value="Titel"
id="viewColumnHeader10" sortable="true">
</xp:viewColumnHeader>
</xp:viewColumn>
You can mention your link instead of blue text.
Hope this helps.
Regards,
CHINTAN P.