No, at least I do not know these hieroglyphs. Maybe this is Windows 10's bug. I change to use SumatraPDF to open any chm files in the future.
I can just tell you that it is not Japanese. It's messy code.
When the language of Windows 10 is set to Japanese, the title of 7-Zip Help is wrong. I tried to set the language to SC and English, the title was right. I cannot tell whether it is the bug of 7-Zip or Windows 10.
Thanks for your reply. By the way, I have a little suggestion about using Zstandard in PeaZip. Now we can create 7z file thanks to 7-Zip-zstd and of course tar.zst file using Zstandard. And with Peazip 8.0.0, it can be easy to create Zstandard 7z file with the option 'Fastest compression, 7Z Zstandard'. But I do not think this is a good idea. I mean, this kind of 7z file is hard to share because only with the zstd-x64.dll by 7-Zip-zstd, we can extract it, and the person who receives it will be more...
https://github.com/facebook/zstd/releases/tag/v1.5.0 https://github.com/mcmilk/7-Zip-zstd/releases/tag/21.02-v1.5.0-R1
Update zstd