The Files form is used to load a file from disk. It is not accessible via the button bar on the Main form. Instead, use the Load From Files button in the Molecules form.
To use this form, first select the appropriate file type from the browser on the left (the available file types are described in section §). One or two text input lines (depending on the molecular structure and coordinate file formats selected) will be displayed in the center of the screen. These need to be filled with the appropriate file names, which can be done in two ways. The easiest is to press the button to the left of the text area to bring up the file browser. The other way is to type the name directly into the text area. To clear the file selection, press Reset; to cancel the operation press Cancel.
Once you've selected the correct file (or files), press the large button that says Load Molecule. The button will disappear and be replaced with a message that says Loading ...Please Wait. After the files are completely processed, the structural information will be displayed in the text window, and the Files form will be closed automatically.