[nyanpasu64]

That's odd, I was definitely able to add a DisplayID 1.3 extension block (128 extra bytes appended) to a CRT monitor's 128-byte EDID data using CRU, then have Windows 11 see those extra resolutions (when the CRT was plugged into a DP-to-VGA adapter). Though I ended up switching to CTA-861 (HDMI extension blocks) with all the HDMI YCbCr/audio nonsense turned off, because 010Editor and edid2json could understand CTA-861 but not DisplayID (though I learned from this article that git://linuxtv.org/edid-decode.git, or https://git.linuxtv.org/edid-decode.git, has better support for EDID standards than the other tools).

Another oddity is that when I run edid-decode on the DisplayID 1.3 file created by CRU, edid-decode reports the block as "Version: 1.2" instead. Wonder what's up with that.