Use Kenlive. Add a new profile with Avi as container and Cinepak as the codec.

but that's also only as far as ffmpeg, which can also do cinepak / msadpcm AVIs - a format which is not specified by the OP.

leileilol wrote on 2024-01-19, 01:45:

but that's also only as far as ffmpeg, which can also do cinepak / msadpcm AVIs - a format which is not specified by the OP.

Sure, but AVI works out of the box.

1ffmpeg -i file.mp4 -threads 0 -vcodec cinepak -vf scale=352:-4,setsar=1:1 -acodec mp2 file.avi

dominusprog wrote on 2024-01-19, 09:31:

Sure, but AVI works out of the box. […]
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Sure, but AVI works out of the box.

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1ffmpeg -i file.mp4 -threads 0 -vcodec cinepak -vf scale=352:-4,setsar=1:1 -acodec mp2 file.avi

But as OP said this way audio is still not playable on OP's gear since Mediaplayer has no mp2 audio decoder.
So instead '-acodec pcm_s16le' should be tried.
16-bit PCM audio can be played without any special audio codecs and it can be used in AVI container.

mp2enc from mjpegtools package (I'm using Debian 12) can encode Mpeg1 Layer 1 audio (and of course Layer2 which is default).
So, you should be able to mux it later with mpeg1 video into mpg container with ffmpeg.

Thanks @dominusprog and @Falcosoft for the contributions. I ended up using both of your suggestions (.avi format + pcm_s16le) and it worked natively on Win95 RTM.
However I keep wondering if is it possible to encode rv10 with native audio to this day by using any method possible. The reason behind that is that I have a YT channel about old computers/retrocomputing/hardware/software and I wanted to do some videos about how video streaming used to be in the old days, by using some old videos that actually surrounded the internet (and gone "viral") by '95 , '96 and '97 (like the Chipmunk Pizza Guy Crash and so on).