Microsoft remedied that in 3.1 by introducing a systemwide OpenSave dialog box system (shown here in Paintbrush) that developers could plug into their products.

Dig deep into your memory, and you may recall a time when Windows 3.1 ruled the Earth.

Twenty-five years ago this month, Microsoft released version 3.1 of its MS-DOS graphical-shell-turned-operating-system.

In honor of this anniversary, lets take a visual tour through Windows 3.1.

In the following slides, Ill highlight many of the innovations this colorful GUI brought to Windows for the first time.

Before Windows Explorer, there was Program Manager, where you could group application icons together any way you wanted, allowing for primitive program organization.

Paintbrush Windows 3.1 Plus Program Groups

For viewing files on your computer, you ran File Manager.) It worked well enough, but juggling the many windows could prove tricky--and you could end up with 50-plus program groups filling your screen.

File Manager let you explore the file system of your computer visually, using a directory tree and an icon-based view of files.

Copying between folders was as easy as a drag and drop, which attracted many novice PC users to Windows.

Microsoft combined File Manager and Program Manager into Windows Explorer in Windows 95, and the arrangement has been that way ever since.

The TrueType font system marked the most important visual innovation in Windows 3.1.

True Type was actually developed by Apple Computer, which--if you can believe it--licensed the technology to Microsoft for free.

Rather than using blocky pixels in a bitmap, TrueType described fonts as curves and lines, which allowed fonts to scale smoothly to any size.

This capability produced amazing printed documents, a big reason why Windows 3.1 flourished as a desktop publishing platform.

Prior to Windows 3.1, if you wanted to save your monitor from CRT burn-in, you either turned it off or installed a third-party screensaver such as After Dark.

In version 3.1, Microsoft included four screensavers: Blank Screen (oooh), Flying Windows (assorted Windows logos soaring by), Marquee (a phrase of your choice scrolling across the screen), and Starfield Simulation (a flight through space, with the stars streaking past).

Of course, users could install many more screensavers, which spawned a back-of-the-magazine cottage industry of screensaver plug-ins that functioned more as eye candy than as a genuine means to protect your monitor.

In the days before easy and ubiquitous access to celebrity-news blogs, office workers often whiled away their idle hours with games of Solitaire and Minesweeper (well, that and doodling with Paintbrush).

Solitaire first appeared in Windows 3.0, but Microsoft introduced the puzzle classic Minesweeper in 3.1, replacing 3.0s Reversi.

Some people claim that Windows Solitaire has wasted more hours of productivity than any other PC application.

Windows 3.1 brought many improvements, but it also introduced a feature that would become the bane of many Windows users: the Registry.

We all know how easy it is for this custom database of hidden system settings to become jumbled and wreak havoc on our machines.

The Registry has survived all the complaints, though: Behind the modern-looking, Metro touch interface of Windows 8, the Registry still lurks.

Back in the days of 3.1, you needed only 12 icons in the Control Panel to configure all of Windows; in my Windows 7 Control Panel, I count 52 icons.

Of course, Windows 3.1 took up just 11MB of disk space, versus 23GB for my Windows 7 install--a good indication of the OSs increasing complexity over the years.).

Windows 3.1 was the first version of Windows to have a modular Control Panel.

You could add new panels to the window shown here simply by copying a special CPL file into the Windows system folder.

What does that mean For example, you could take a Paintbrush bitmap file and embed it into a Write word processing file, as shown here.

But if the bitmap were linked instead, any external changes in the bitmap would be reflected in the Write file.

We take such functionality for granted these days, but 25 years ago this was a major convenience.

Paintbrush Windows 3.1 Code Their Own

Prior to Windows 3.1, application authors had to code their own OpenSave file dialog boxes from scratch for every program, which led to confusing inconsistencies.