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SOME OF THESE FILES MAY BE OS SPECIFIC, I.E IT MAY ONLY RUN ON WINDOWS 95, 98 , NT, 2000, OR WIN7 32BIT
I AM ALSO NOT RESPONSIBLE FOR ANY LOSSES YOU MAY SUFFER FROM USING THESE CODECS, USE SANDBOXXIE TO BE SAFE
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You can use VirtualDub/VirtualDubMod (Try to use 32bit as much as you can), or MEncoder/MPlayer to Encode and View the avi's encoded with these codecs.
https://managedway.dl.sourceforge.net/project/virtualdubmod/VirtualDubMod/VirtualDubMod%201.5.10.2/VirtualDubMod_1_5_10_2_All_inclusive.zip
If VDub doesn't fit your fancy for some reason (Sometimes when you install a codec driver, it wont show up in VDub) 
you can use MEncoders vfw options like so:


mencoder input.mp4 -ovc vfw -xvfwopts codec="/Users/Username/Downloads/igcodec.dll" -nosound -o output.avi
mencoder input.mp4 -ovc vfw -xvfwopts codec="/Users/Username/Downloads/OldAndObscureCodecs/Rududu.f i l e s/rududu.dll":compdata=dialog -o output.avi
ffmpeg -i input.mp4 -c:v huffyuv -s 1920x1080 -f avi -t 5 -an - | mencoder32 - -ovc vfw -xvfwopts codec="/Users/Username/Desktop/OldAndObscureCodecs/Loss-Less Codec Library(AVImszh + AVIzlib)/LCL223/avizlib.dll" -o output.avi


You MUST use forward slashes in your .dll path for some reason like I did above, this does not work: 
-xvfwopts codec="C:\Users\Username\CodecDirectory\igcodec100\igcodec.dll"

If you have trouble loading a codec with an error message like "Can't open library:" or "ICOpen failed! unknown codec / wrong parameters?" 
try moving the .dll to your Desktop or something and try again. Sometimes whitespace or certain special characters appear to mess with MEncoder.
I had trouble adding vfw codecs manually to the  MEncoder/MPlayer codecs.conf.in file, but if you can figure it out heres some links:
https://www.hellocatfood.com/tag/mencoder/
http://www.mplayerhq.hu/DOCS/HTML/en/menc-feat-video-for-windows.html
http://www.mplayerhq.hu/DOCS/tech/win32-codec-howto.txt
http://www.mplayerhq.hu/DOCS/tech/codecs.conf.txt
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Extra Spicy Stuff:
http://www.mplayerhq.hu/MPlayer/releases/codecs/all-20110131.tar.bz2 ; http://www.mplayerhq.hu/MPlayer/releases/codecs/all-20071007.tar.bz2
https://sourceforge.net/projects/mplayer-allin1/ <-- havent tested
https://github.com/fishman/virtualdub
https://astuteinternet.dl.sourceforge.net/project/virtualdub/virtualdub-win/1.10.4.35491/VirtualDub-1.10.4-AMD64.zip
https://astuteinternet.dl.sourceforge.net/project/virtualdub/virtualdub-win/1.10.4.35491/VirtualDub-1.10.4.zip

This version may be better for Datamoshing? (I know Rosa Menkman used it for Datamoshing at some point): 
https://sourceforge.net/projects/virtualdub/files/virtualdub-win/1.9.11.32842/ , 
https://forum.videohelp.com/threads/350898-datamosh-all-I-frames-in-video-how-to-get-p-frames , 
http://rosa-menkman.blogspot.com/2009/02/how-to-datamoshing-create-compression.html
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If you're feeling lucky...

Big List of files: 
https://web.archive.org/web/20090211042628/http://www.drakan.ru:80/FTProot/vid_work/codecs/
Some files were archived from here, so far they actually do install codecs but it looks like their own installer was used; so proceed with caution.
https://web.archive.org/web/20040525025626/http://www.dshow.narod.ru/