"Core" application-specific files (those that are not related to registering the application with the Desktop or displaying it in the user interface prior to launching) reside in a dedicated "application directory."

The application directory contains:

The application directory is a subdirectory of:

In the example explained here, the application's directory is named pyglade, as follows;

For the sample application considered in this wiki page, this directory contains the following:

Now, let's take a tour of the actual files, starting with the critical .desktop file.