Serving tech enthusiasts for over 25 years. TechSpot means tech analysis and advice you can trust . Editor's take: Microsoft continues to tightly control the release of some of its most important pieces of legacy software. While enthusiasts and programmers are eager to see newer versions of MS-DOS made available, Redmond remains focused on preserving early DOS releases, which offer limited value for future development efforts. Microsoft has officially released another significant piece of DOS history. The " Paterson Listings " include the earliest known source code related to the DOS platform ever discovered, the company explained , providing scanned listings and several transcribed portions that have been converted into compilable source code. Tim Paterson's DOS listings continue the "tradition" Microsoft began a few years ago, when the company released MS-DOS 1.25 and 2.11 as open-source code.…