DfontSplitter is simply a graphical wrapper program for fondu, which is the program that actually extracts and converts .dfont files.

Due to the way DfontSplitter on Mac OS X is built, any errors reported by fondu will be displayed in a dialogue box. However, if you are having errors that are not being reported in this way, or simply want to use the command line program anyway, the following process is how.

First, launch Terminal from /Applications/Utilities/Terminal.

For each of the commands below, type the command into terminal as you see it and press Enter afterwards. Do not type the leading '$'. This is to show you where the prompt ends in these examples.

$ cd "outputfolder"

Replace outputfolder with the path to the folder you want the extracted files (for example, /Users/Peter/output).

$ "/Applications/DontSplitter.app/Contents/MacOS/fondu" "sourcefile"

Replace sourcefile with the path to the source .dfont file that you want to convert. Also, change the path to dFontSplitter.app if you installed it somewhere other than /Applications.

If the operation is successful, fondu will not return any output, but the extracted files should be in the folder. To show the folder in the Finder, you can then use the command:

$ open .

If any errors occurred, fondu should give you details on them.