[Mr. K]

Microsoft has been guilty of this stuff in the past

In the 80’s under DOS operating system you had to load a memory manager to access memory over 640K

A company called Quarterdeck made a memory manager competing against Microsoft’s own memory manager

I found that Quarterdeck’s QEMM.sys would NOT load under DOS... but when I changed the name from QEMM.sys to XEMM.sys it loaded and ran perfectly.

I did a binary search through the executable file and found the string QEMM hard coded into the file. (command.com, I think)... Microsoft was purposely making DOS fail to load it.

Microsoft should have been sued for $Millions. Quarterdeck also had a multi tasking GUI first- before Microsoft came out with Windows. It was a shell that ran on top of DOS and let you run multiple programs at once. (In the olden days, Under DOS you could only run one program at a time)

[oh8eleven]

A company called Quarterdeck made a memory manager competing against Microsoft’s own memory manager
I remember their memory manager (we must be old!), although I must admit, not the install problems.
On the other hand, I loved DR DOS, but it too had install/running problems thanks to ... you know who.

How MS played the incompatibility card against DR-DOS."
"Microsoft had several methods of detecting and sabotaging the use of DR-DOS with Windows, one incorporated into "Bambi",
the code name that Microsoft used for its disk cache utility (SMARTDRV) that detected DR-DOS and refused to load it for Windows 3.1. "

[FreedomPoster]

A related catchphrase from that time:

“DOS isn’t done until Lotus won’t run.”