I have been sent a QuarkXPress document which contains a number of unusual fonts which were also sent to me. The fonts were in a folder named fonts and then it was all zipped up into a single archive containing the document and fonts folder. I believe this was done on a machine running Mac OS X.

I have unzipped the archive, but all of the files in the fonts folder have no size - i.e. they are 0 bytes files. However there is also a _MACOSX folder which has a fonts subfolder. In here I can see all the font files (prefixed with .) and they all have a size, i.e. are not 0 bytes. Presumably these are the actual font files I need but I cannot figure out how to install them on Windows.

I have tried renaming the files to have .ttf and .otf extensions and then installing them but that doesn't seem to work - I just get an "Invalid font file" message.

Any other ideas?