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Doesn't actually add the loader section to manifest. :-O
...and for XML types, the loader must be Install-Before: org.openide.loaders.XMLDataObject, org.netbeans.modules.xml.core.XMLDataObject so that it actually works to recognize the files.
fixed.
the files however still don't get recognized when running the module with the loader. In the options UI everything looks ok. I will investigate tomorrow.
it actually works. but one needs to restart the IDE, file a issue for that #61918
verified