The FileHandle class is an abstraction class for handling input/output data stream which includes the ModelFile class for model file management, the FEFile class for fixed-format text file handling used to communicate with external solver and the TempFile class for controlling cached file which is used to speed up the input/output data streaming. The solvers for analyzing disciplinary problems are developed independently by using VF due to its efficiency for handling mathematical and matrix/vector operations with several object-oriented features supported by Fortran 90/95