 to the symbolically named types listed above, unknown
types are identified using a 32-bit integer that corresponds to the
type code returned by the system interfaces.  In this case, the data
is represented exactly in Tcl, including any embedded nulls.
<H3><A NAME="M22">PORTABILITY ISSUES</A></H3>
The registry command is only available on Windows.
<H3><A NAME="M23">EXAMPLE</A></H3>
Print out how double-clicking on a Tcl script file will invoke a Tcl
interpreter:
<P>
<PRE>package require registry
set ext .tc