SVGZ file opens in IE8 but not in Firefox 3.5

oliver <[email protected]> Fri, 14 Aug 2009 11:57:47 -0700 (PDT)

Newsgroups	gmane.comp.mozilla.devel.svg
Organization	http://groups.google.com
Message-ID	<[email protected]>

I have SVGZ files i could open with IE but when i try to open qit
Firefox i get en error page:
"Error de parseo XML: malformado
Lugar: file:///H:/mpi/mpi/tests/com/mpi/engine/oem/chrysler/builder/source/2009/PT/wiring/images/80f5a1f0.svgz
Línea 1, Columna 1:"

"Error parsing XML: malformed
Place:  file:///H:/mpi/mpi/tests/com/mpi/engine/oem/chrysler/builder/source/2009/PT/wiring/images/80f5a1f0.svgz"
Line 1, Column 1:"

Any ideas?
If i unzio the svgz file to svg i can open it with Firefox, but not
when the file is SVGZ