1.
The source code of the underlying libraries is in C:\msys64\home\MP64. 
These include:
arb-2.23.0
eigen
flint-2.9.0
gmp-6.2.1
math-boost
mpc-1.3.1
mpfr-4.2.0
multiprecision-boost
SQLiteCpp

2. 
C++ source code for the use of Boost (double, long double, quad, mpfr, dec50) in in C:\msys64\home\mpboost
This includes:
BoostMath64


3. 
C++ source code for the use of Eigen AND Boost (double, long double, quad) in in C:\msys64\home\mpeigen. 
These include:
EigenDense
EigenCalculus
Eigen64
This exports both the functionality of Eigen AND Boost separately in 3 Dlls.
To export into just 1 Dll, the file UseDblMat.cpp needs to be expanded into 3 different files.
Same for mpNumC_Double.h. The name part Eigen_Dbl should changed to Eigen_Real everywhere.


4. 
C++ source code for the use of SQLite, Eigen (Dbl, Ext, Quad, Mpfr, Arf, Arb, Decr. Fmpq), and Mpfr, MPC, Flint, Arb in in C:\msys64\home\mpfunlab
This includes:
SQLite
EigenDenseAny
mpfunlab


