Many thanks,
this works with .docx and .xlsx.
But to view ".doc" and ".xls" I had to add ".doc" and ".xls" to "ExtBrowser":
[HKEY_CURRENT_USER\Software\Kinook Software\Ultra Recall\Options]
"ExtBrowser"=".html;.htm;.mht;.nws;.msg;.ico;.gif; .zip;.eml;.xml;.pdf;.doc;.xls"
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