how to test the existence of a file on the hard disk ?

Hello all,

I want to check if a file exists on the hard disk with XSL.
I tried this way without success :

<xsl:variable name="delivery_File"
                          select="c:/XML/nameOfFile"/>

<xsl:choose>

         <!-- we did not find the deliveryFile in this directory  -->
         <xsl:when test="not($delivery_File)">
                    ............
         </xsl:when>
          <!-- we find -->
          <xsl:otherwise>
                  ...........
          </xsl:otherwise>

</xsl:choose>

My procedure XSL never goes in <xsl:otherwise> even if the file exists.

Is it possible with XSL ?
Is anyone knows a solution ?

Thanks in advance



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