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It seems PropertiesDataLoader only recognizes files with .properties extension and ignores other files with associted text/x-properties MIME type. To reproduce: - create new file myprop.abc (Other>Empty File) - open Tools>Options>Miscellaneous>Files - click New button - type abc and confirm - from MIME type combo box select "Properties Files (text/x-properties)" - click OK button - it should change icon of myprop.abc to icon of properties files and if you open myprop.abc in editor, it should be recognized as property file.
I'm added case which check that extension is .properties. So probably it should be removed.
The problem is more complicated, because PropertiesDataLoader doesn't never knows that new extension was added.
Created attachment 77136 [details] patch
changeset 8edc317f2c68
Verified.