From Wiki96
Mikesoft is the fictional company used for the Windows 96 branding. The name was chosen since it closely resembles the name "Microsoft", the original developer of the Windows Operating System.
The name does not mean anything, and is an alternate way to refer to Sys36, especially when talking in the context of Windows 96 "branding". In other words, you should assume all Mikesoft products are actually Sys36 products.