If it was in fact removed from the "official" MS-DOS, and one wanted to
(re)implement it anyway, perhaps browsing the code of the open-source
recreation of OS/2 would help? It has a FAT32 driver which is compatible with
the OS/2 IFS and, as I recall, OS/2 was more of a direct successor to MS-DOS
than Windows ever was, so perhaps its code would be more helpful to a DOS dev
as opposed to the Windows versions.
Not sure, I haven't dug too deeply into that myself, but hope it possibly helps.
https://www.arcanoae.com/wiki/fat32/
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------- Original Message -------
On Monday, February 20th, 2023 at 2:58 PM, Aitor Santamaría
<aitor...@gmail.com> wrote:
> Thanks, Ralf!!
>
> So I thought, but I have read a couple of references (such as the following
> in Wikipedia, but not the only one) by which the IFS was present in MS-DOS
> 4.X, of course as well as in OS/2 and Windows:
>
> [Installable File System -
> Wikipedia](https://en.wikipedia.org/wiki/Installable_File_System)
>
> Apparently, there was some support for it that was probably removed for
> MS-DOS 5.0 and later. Part of the mystery (to me) of MS-DOS 4.X! :)
>
> In RBIL, the only reference I've found is to IFSHLP.SYS, which was a Windows
> mean to guess what has been installed before getting into protected mode, so
> I am not sure is if this has to be with the IFS that was planned and
> implemented in MS-DOS 4.0.
>
> Aitor
>
> On Mon, 20 Feb 2023 at 18:27, Ralf Quint <freedos...@gmail.com> wrote:
>
>> On 2/19/2023 5:38 PM, Aitor Santamaría wrote:
>>> Hello,
>>>
>>> Does anyone know if the IFS (Installable File System) API is
>>> documented anywhere?
>>>
>> Just checked in my archive of docs, and there is a MSCDEX.TXT, which
>> describes the interface for the CD-ROM "network redirector".
>>
>> It can apparently be found online at https://cybermax.tripod.com/mscdex.txt
>>
>> Ralf
>>
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>> Freedos-devel@lists.sourceforge.net
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