To extract an external function or library of external functions
Select the Extract command from the Functions menu.
The common Save As dialog is then displayed, to enable you to specify the name and location of your extract.
If the dialog is accessed when an external function library is selected, all external functions in that library are extracted to an .scm file, which has a prefix of ExternalFunctions_schema-name.
If the dialog is accessed when an external function is selected, that external function is extracted to a .mth file, which has a prefix of schema-name_external-function-name. The location defaults to your JADE working directory.