Drag content from an app onto the Desktop or a location in a Finder window to create a clipping file. Although they date back to the early 1990s, they’re still well supported in Tahoe.
mailloc
A summary of the resource types used in these files, and their modern data equivalents, from ‘classic’ Mac text to Unicode, RTF and even WebArchive.
Introduced in about 1999, they come in 3 flavours: weblocs, maillocs and textClippings. How they have changed, how you can still use them, and how to fix them.
The Eclectic Light Company 