Problem with ClientBundle DataResource -> cryptic url

Hello!
I have a pdf file that I want users to be able to download if they
click on an hyperlink so I have tried to implement clientBundle
following the example on the GWT website :
http://code.google.com/webtoolkit/doc/latest/DevGuideClientBundle.html

public interface MyResources extends ClientBundle {
public static final MyResources INSTANCE =
GWT.create(MyResources.class);

@Source("manual.pdf")
public DataResource ownersManual();
}

[somewhere else in my code]
@UiHandler("tutoPdf")
void onTutoPdfClicked(ClickEvent event) {
Window.open(MyResources.INSTANCE.ownersManual().getUrl(), "tutorial",
"");
}

Here is the string returned by
MyResources.INSTANCE.ownersManual().getUrl() :

data:application/
pdf;base64,JVBERi0xLjQKJcOkw7zDtsOfCjIgMCBvYmoKPDwvTGVuZ3RoIDMgMCBSL0ZpbHRlci9GbGF0ZURlY29kZT4+CnN0cmVhbQp4nH1Ru2oDMRDs9RVbB6TM6vQEIYhjX5HOIEhxpMsDUhjsJr8fScThcsRCsNrVMjuzIyimL3EmkERNHesafWzx8kbPd3TqzXYuH2JXhHUqkGeoicor3c9MrKm8LwmcXUjQWfqEKbsEk3WChYNHqHcvY5ahdRgJDz3ftedH7DMnHPJLeRKHIo7/
sToXVNyyzvmX1GRZWffjGdbW1dYzEgMzI5fP2yDD13X1DwhcSUcQ7ZX9A1maK1I3n7oDQ5U8KX8LPQLaGDcWJeaRThvcxo
+lG1I1sh5TGXPVuHKyfjUzY0V6pG/
QGoQnCmVuZHN0cmVhbQplbmRvYmoKCjMgMCBvYmoKMjMyCmVuZG9iagoKNSAwIG9iago8PC9MZW5ndGggNiAwIFIvRmlsdGVyL0ZsYXRlRGVjb2RlL0xlbmd0aDEgMTEwMzI
[I spare you about 100 lines of the same cryptic chatter... ;-]
+4zuvDP8dp9Lto9ryEeaUfX76O37iOxev48DUcuobnPl74mPz5aqnrmauXrpLOK8NXnrnCVV7B5itYh5YsS6Gl8NLM0rklrcH8EU5HH2Lrv16uc70feK/
3D4F3e9F7uCH03tx7ifc4WsgNvKczBt/DXO
+7nMNlWRQXKxdnFucW31y8vHh1UTf384Wfk//6os9lftH1InFd6Lxw+AIX/
iE2/9D1QxI6Ez5DFs5i81nXWd9Z7vuPVrgebct3PfJwsevyw1cfZl8N1TycYQ0O/
yd8+Hunvkdmvjv33YXvcnPHFo6RZw5cOkBioVLX9JTXNdUmu4RATm9agOvVcivsC7KWnZ6SYHhYcQ2D0OBApWugrdSVFcjs1cBgeRA0cy6uievkprlT3CUuTbctlO/
qgvty6GqImDtdnb5O9q1PpMMNitpn2ufauS3BUpfa

I am using GWT 2.0.2, I have some .png images that works fine using
ClientBundle (I don't use the method .getUrl() on them though, no
need) but anyone knows what I am doing wrong with DataResource ?

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