TUserDefinedFunction.InternalName Property
Name that will be used when saving xls (biff8) files. Some functions are saved by Excel 2010 as .xlfn_Name when saving xls (not xlsx). This is the name that should be saved in the xls file, not the real name of the function.
Syntax
Unit: FlexCel.Core
property TUserDefinedFunction.InternalName: string