Families of types covering most forms of metadata, published in open source in 2009. Now largely superseded by com.apple.metadata equivalents.
You have double-clicked on a disk image, and macOS refuses. Here is what you can do to get that image to mount, even when it’s damaged.
The File menu has been tidied, and xattred can now save the one xattr selected or all of them to a text file.
Do you trust the file size given in Finder’s Get Info dialog? Perhaps you shouldn’t, as it only consider part of the file, its data fork.
A tag containing the filename of a file still held remotely in iCloud, attached to a stub. Only in iCloud files.
Scripts and apps which could look at folders in iCloud should watch for stub files. Here’s how they work, and why they can mislead.
Its purpose is unknown, but it is automatically attached to contents of apps downloaded from iCloud Drive, if to a different system from the uploader.
How the two user modes differ, what iCloud Drive does to files transferred between two different clients, and an apparently unique tag it applies to apps which pass through.
Gatekeeper doesn’t seem interested in extended attributes attached to the contents of signed apps – the signature remains valid. Could this be exploited?
The Desktop and Finder illusions are held together by Launch Services, which associates file types with apps. This and more now hinge on the UTI.