Wine runs 16-bit Windows programs on 64-bit Windows by the use of 16-bit protected mode segments through modifying the Local Descriptor Table. The 64-bit Windows port of WineVDM (OTVDM) has to use a CPU emulator because processes can only modify their LDT on 32-bit Windows (where you can just use native WOW.)
There is not technological limitation that Windows is enforcement I'm not entirely how current WineVDM traps "DOS" calls made by 16-bit Windows programs or handles their expectations of Windows being extended DOS (e.g. int 21h and a PSP, for starters) but for the most part, most apps designed for Windows 3.0 or later expect to be ran in protected mode in a 16-bit protected mode segments to begin with. This contrasts with the previous implementation of WineVDM that used vm86 (and could even directly run some DOS programs, mainly non-interactive utilities.) On Tue, Dec 17, 2024, 13:48 Liam Proven via Freedos-devel < freedos-devel@lists.sourceforge.net> wrote: > I don't know -- there's WINE. It runs 16-bit apps on 64-bit OSes, > which is more than Windows itself can or will. >
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