Let's see our example: the cmas2d_customlib problemtype.
The problem-type is located in problemtypes/Examples/cmas2d_customlib.gid
Inside this folder, we can find several files. The most important ones are:

cmas2d_customlib.xml

Declares some information about the problemtype, such as the name, the minimum GiD version, a description, etc.

cmas2d_customlib.spd

A xml file that defines the tree interface.

cmas2d_customlib.tcl

Contains Tcl code to process some GiD events, add some menu entries and the functions to write the input file. This file also includes more tcl scripts files under cmas2d_customlib.gid/scripts/ folder .

cmas2d_customlib.win.bat | cmas2d_customlib.unix.bat

Script that launches the solver in MS Windows or in Linux/macOS .

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