What is the "boost_interprocess" folder in iCloud "Documents"? While cleaning up old files I've found an empty "boost_interprocess" folder in my iCloud "Documents" folder (it's really empty: checked in Terminal).

Any idea what this folder is for - a quick search seems to find a lot of references to this folder in Windows and one answer on Stack Overflow, but I'm mystified as to what created this?

I'm on OS X Mojave 10.14.4, MacBook Pro.
QuarkXPress creates a "boost_interprocess" folder

I've just found the answer. This folder can be created for several process, but in this case it's QuarkXPress, as outlined in this QuarkXPress support post.