Yudit can use the external library Hunspell, 
that was written by Laszlo Nemeth and Ferenc Godo.

syntax-1.6 exe Package contains:

- hunspell.dll from hunspell-1.7.2 
- aff and dic files from git

Destination:
- syntax-1.6.x86_64.exe unpacks to
  C:\Program Files\Yudit\syntax

- syntax-1.6.i586.exe unpacks to
  C:\Program Files (x86)\Yudit\syntax

If you want to update the syntax files, just copy
everything from C:\Program Files\Yudit\syntax
to My Documents\.yudit\syntax directory, and there
you can update / add new aff and dic files.

A yudit package with at least build #9 needs to be installed.
yudit-3.0.8-9.x86_64.exe
yudit-3.0.8-9.i586.exe

Source code:
hunspell-1.7.2.tar.gz 
https://github.com/hunspell/hunspell

aff and dic from master:
git://anongit.freedesktop.org/libreoffice/dictionaries
https://cgit.freedesktop.org/libreoffice/dictionaries

If you want to recompile the hunspell dll you can do it on Linux:
sudo apt -y install mingw-w64

tar xfz hunspell-1.7.2.tar.gz
cd src/hunspell
# for 32 bit CXX=/usr/bin/i686-w64-mingw32-g++-win32
CXX=/usr/bin/x86_64-w64-mingw32-g++-win32
${CXX} -DNO_MAIN -I. -I../.. -D_WIN32 -DBUILDING_LIBHUNSPELL -fpic -fPIC -c -O2 *.cxx
${CXX} -static-libstdc++ -static-libgcc -shared -o libhunspell.dll *.o

Gaspar Sinai 2023-01-21, Tokyo