files downloaded from the Internet, mostly from unicode.org web site

some another links:
https://www.unicode.org/Public/MAPPINGS/VENDORS/MICSFT/WindowsBestFit/bestfit1251.txt

downloaded links:
windows-{NUM}.txt = https://www.unicode.org/Public/MAPPINGS/VENDORS/MICSFT/WINDOWS/CP{NUM}.TXT
874 932 936 949 950 1250 1251 1252 1253 1254 1255 1256 1257 1258

cp{NUM}.txt = https://www.unicode.org/Public/MAPPINGS/VENDORS/MICSFT/PC/CP{NUM}.TXT
437 737 775 850 852 855 857 860 861 862 863 864 865 866 869 874

8859-{NUM}.txt = https://www.unicode.org/Public/MAPPINGS/ISO8859/8859-{NUM}.TXT
1 ... 16

https://www.w3.org/2001/06/utf-8-wrong/UTF-8-test.html
