A problemtype is composed by these files (most are not compulsory):
Configuration files

• <problem_type_name>.spd: Xml file defining conditions, materials, problem data and units definitions

Script files

• <problem_type_name>.tcl : Write data input file with a Tcl procedure

Tcl extension files

• <problem_type_name>.tcl Extensions to GiD written in the Tcl/Tk programming language

Command execution files

• <problem_type_name>.bat Operating system shell that executes the analysis process