[yuhong]

Of course, MS was also not as willing to provide the MS-DOS OAKs/BAKs to random users than DR was with CP/M. When they finally stopping copying the model before OS/2 1.0 was released, they still did things like putting the floppy and hard drive drivers in the same file.

[EvanAnderson]

Reference for people like me who didn't recognize the acronym OAK: "OEM Adaptaion Kit", <http://www.os2museum.com/wp/ms-dos-oaks/>

[yuhong]

And BAK stands for Binary Adaptation Kit.