This method writes the Name, FormDefinitions, Operations, Identification, and OtherDataItems properties to a form set file.

You must lock the form set file using the Lock method before you call this method.

Note that this method writes the Filename property of each FormDefinition object in the FormDefinitions collection to the form set file, but it does not write the form definition files. Normally, you should loop through each FormDefinition in the FormDefinitions collection and write the ones that have changed to a form definition file. You should do that before writing the form set file since writing the form set file will set the HasChanged property of each FormDefinition to false.

Reference

FormSetFile Class
FormSetFile Members
Read Method
Lock Method
Filename Property