[Bundlers] content type is not set for Windows when specifying file associations

When I install application with file associations, set to this value:
[{fileAssociation.extension=[foo, bar], fileAssociation.contentType=[application/example, hello/world], fileAssociation.description=The sample description}, {fileAssociation.extension=[mambo, jumbo], fileAssociation.contentType=[application/sample], fileAssociation.icon=C:\Cygwin\home\gtee\dg\appBundlerTests-8u40\build\classes\com\oracle\appbundlers\utils\resources\icon2ico}], I can't see any trace of content types, which should be shown when I try to do

$ reg query HKEY_CLASSES_ROOT\.\.foo

You may look at output of, for example, this command line:
$ reg query HKEY_CLASSES_ROOT\.\.xml

To reproduce:
1) bundle application (.exe installer) with similar file association settings
2) install it
3) run "reg query .<extension>"