The following should work for you:

	<xsl:param name="fileExtn">
	     <xsl:value-of select="/CONTROL/ObjectFormat[1]/@FileExtension"/>
	</xsl:param>


In almost all circumstances it is better to use


	<xsl:param name="fileExtn"
           select="/CONTROL/ObjectFormat[1]/@FileExtension"/>

as that passes the attribute node itself, which is more efficient and
more useful, rather than using the form with value-of which generates a
result tree fragment consisting of a root node and a text node with the
string value of the attribute.

David


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