I want to extract some files from a game archive providing path strings like "data/ai/campaign/leaders.csv".
So I tried mkdirRecurse to create the directory structure, this works fine but also creates folders named after the files, "leaders.csv" in this case.
So I added dirname:
mkdirRecurse(dirname(toUTF8(entry.filename)));

This doesn't work, telling that it can't create a folder that already exists.