File Juicer
File Juicer for macOS
Overview of Formats

Search & Extract

Images

jpg jpeg 2000 gif png pdf wmf emf tiff eps pict bmp

Video

mov mpeg avi wmv

Sound

mp3 wav System 7 au aiff

Text

ascii rtf html

From:

avi cab cache chm dmg doc emlx exe ithmb m4p mht mp3 pdf pps ppt raw swf wps xls zip and other formats

.dll - Windows - Dynamic Link Libarary

DLL files are "Plugin" extensions to or optional parts of Windows applications.
DLL files can contain anything and File Juicer can search them as it can search any other file format. But they are not intended for Mac users and the proper use will likely need a Windows emulator.

See EXE files