I have made a minor update of the distribution, to fix a problem reported on a localised version of Excel. In particular, using Tools->Add-Ins to add the .xll would fail, even though opening the add-in using File->Open worked fine.
Related to the fix, I now use a Name attribute on the DnaLibrary tag in the .dna file to customise the library name. If there is no such tag, the name of the library is the filename (without extension). The library name is used as the default category and menu name, and appears in the Add-Ins dialog box.