MacOS – What does the “cdw” do exactly in the canned Search for “Recents”

The Finder's sidebar search for "Recents" (in High Sierra) is a raw query, which can be found here:
/System/Library/CoreServices/Finder.app/Contents/Resources/MyLibraries/myDocuments.cannedSearch/Resources/search.savedSearch.

The query string goes like this:

(kMDItemLastUsedDate = "*") && ((kMDItemContentTypeTree = public.content) || (kMDItemContentTypeTree = "com.microsoft.*"cdw) || (kMDItemContentTypeTree = public.archive))

This also looks for Microsoft stuff. The relevant part of the query is:
kMDItemContentTypeTree = "com.microsoft.*"cdw

What does the "cdw" part of this query accomplish? And what does it stand for?

I found another mention here for mdfind usage:
https://gist.github.com/cwalston/7425465

!   -interpret        Force the provided query string to be interpreted as if the user
!                     had typed the string into the Spotlight menu.
!                     For example, the string "search" would produce the following
!                     query string:
!                     (* = search* cdw || kMDItemTextContent = search* cdw)