The control of the project file is normally run in the background; however you can directly add and change files in a project by simply using the Project ->Edit Project file command. From the Project menu select the item entitled Edit Project File as depicted in Figure 86 below.

Figure 85 Project->Edit project File
When you do medit opens in the Project Edit mode as depicted in Figure 87.

Figure 86 Project Edit screen
A project file is a file containing a collection of file names for easy reference. From the Project Edit screen you can Change the sort order, Add, Remove, Delete, or Preview a file as a text file. Each of the commands brings up an appropriate dialog box to assist you in completing the requested function.