ObjectPascal ChangeFileExt Function Change the extension part of a file name SysUtils unit

function ChangeFileExt ( const FileName, Extension : string ) : string;

Description The ChangeFileExt function changes the Extension value of a file FileName, returning the new value as a string. Related commands ExtractFileExt Extracts the extension part of a full file name ProcessPath Split a drive/path/filename string into its constituent parts		Example code : Renaming Unit1.dcu to Unit1.old var   oldName, newName : string; begin   // Try to rename the current Unit1.dcu to Uni1.old   oldName := 'Unit1.dcu';   newName := ChangeFileExt(oldName, '.new');   // Show the old and new values   WriteLn('Old name = '+oldName);   WriteLn('New name = '+newName); end; Show full unit code    Old name = Unit1.dcu    New name = Unit1.new