Here is a list of all files with brief descriptions:

nfiq2.hpp
nfiq2_algorithm.hpp
nfiq2_constants.hpp
nfiq2_data.hpp
nfiq2_exception.hpp
nfiq2_fingerprintimagedata.hpp
nfiq2_modelinfo.hpp
nfiq2_qualityfeatures.hpp
nfiq2_timer.hpp
nfiq2_version.hpp