With this option you can load an existing file from disk.
BASCOM saves files in standard ASCII format. Therefore, if you want to load a file that was made with another editor be sure that it is saved as an ASCII file. Most programs allow you to export the file as a DOS or ASCII file.
The following dialog window will be shown.

You can preview the supported files at the right of the dialog window.
While you can open and edit files, they are not added to the project ! Use the PM to add existing files to your project.
File open shortcut :
, CTRL+O