Hi ! Currently the streaming mode doesn’t support the use of pathlib.Path, you have to use os.path.join instead.
You should end up with the url
zip://data/images/d29/e7c/d29e7c6a3028418c64eb15e3cf577c2.jpg::https:/huggingface.co/datasets/flax-community/YFCC100M_OpenAI_subset/resolve/main/data/d29.zip

which is a compound URL. It allows to read/stream only one single file from a remote zip file.
Feel free to open an issue on github on huggingface/datasets so that we can start working on the support for pathlib