We are pleased to provide binaries for file_textarray_fdw and odbc_fdw for PostgreSQL 16 Windows 64-bit.
To use these, copy the files into your PostgreSQL 16 Windows 64-bit install folders in same named folders and then run CREATE EXTENSION as usual in the databases of your choice. More details in the packaged README.txt
These were compiled against PostgreSQL 16rc1, but should work fine against EDB PostgreSQL 16beta3.