Choose a file to import as a font.  Only .OHF files can be used.

Navigate with the Up and Down arrow keys.

Press ENTER or SPACE on a folder to open it.

Press ENTER or SPACE on a file to choose it to import.

Press ESC to cancel and return to the Font Editor.

You can type in the beginning of a folder or file name to move the cursor to it. You can also press a letter repeatedly to cycle through files and folders starting with that letter.

Press F5 to refresh the directory as well as poll the names of all removeable drives.