Every copy of Windows comes with a file named MORICONS.DLL which was first distributed with Windows 3.0. As far as I know, this file has not been changed since Windows 3.0. Some of the icons include:
- Borland C++
- Kid Pix
- All the Lotus products available at the time (Freelance Graphics, cc:Mail, 1-2-3, Magellan)
- Gazelle Q-DOS (the blue, file tree-looking icon. It's a directory manager program)
- Over a dozen WordPerfect-related icons
- Borland Sidekick
- Paradox 4.0
However, there are some I only vaguely recognize:
- Another Gazelle product: Back-It or OPTune?
- Two other directory managers
- A Digital product related to X-Windows
- An XcelleNet product
- An shaded icon with the letters "ADOS" on it -- possibly a predecessor to OS/2?
- Several different variations of extremely '90s-looking abstract squiggles
- Other completely mysterious icons, many proclaiming themselves to be Microsoft products for DOS
If anyone can provide more details on any of these icons, please let me know. You can check your own copy of Windows for the MORICONS.DLL file.