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Microsoft Operating System/2 Software Development Kit 1.05 (OS/2 SDK) 5 1/4"

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Vintage Microsoft QuickC 5.25" Floppy Disk Set – Complete Developer Tools (x8)

Microsoft MS-DOS 6.22 Plus Enhanced Tools - complete set 3.5" floppy disks

Apple Mac OS X Developer Tools CD for v10.2 or Later July 2002 691-3744-A

PC Magazine DOS Power Tools Second Edition 2x 5.25" Floopy Disks