GGeoXml loading dynamic link

Hi, I'm stuck with a problem with loading a KML file into maps/earth
via GGeoXml. The kml file was created in GoogleEarth. It is accessible
through my link:
http://www.portal-rowerowy.pl/file.php?id=417

wget (on linux) shows mimetype of this file while downloading:
HTTP request sent, awaiting response... 200 OK
Length: 77128 (75K) [application/vnd.google-earth.kml]

Despite it's supposed to be alright it can't be displayed on map:
Please try paste this code into google playground to check the
problem:
http://code.google.com/apis/ajax/playground/?exp=maps#geoxml_kml

var map;
var geoXml;
var toggleState = 1;

function initialize() {
if (GBrowserIsCompatible()) {
geoXml = new GGeoXml("http://www.portal-rowerowy.pl/file.php?
id=417");
map = new GMap2(document.getElementById("map_canvas"));
map.setCenter(new GLatLng(52.42228990140251, 21.0822035425683),
8);
map.addControl(new GLargeMapControl());
map.addControl(new GLargeMapControl());
map.addOverlay(geoXml);
}
}

function toggleMyKml() {
if (toggleState == 1) {
map.removeOverlay(geoXml);
toggleState = 0;
} else {
map.addOverlay(geoXml);
toggleState = 1;
}
}

function toggleMyKml() {
if (toggleState == 1) {
map.removeOverlay(geoXml);
toggleState = 0;
} else {
map.addOverlay(geoXml);
toggleState = 1;
}
}

The link and the file work good when it's used in this playground:
http://code.google.com/apis/ajax/playground/?exp=maps#fetch_good_kml

Why is that happening ?

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