Extracts the drive part of a full file name SysUtils unit
 function ExtractFileDrive ( const FullFileName : string ) : string;
The ExtractFileDrive function extracts from FullFileName the drive substring.
If the file name does not contain a drive prefix, then an empty string is returned.
Related commands
ChangeFileExt Change the extension part of a file name
ExtractFileDir Extracts the dir part of a full file name
ExtractFileExt Extracts the extension part of a full file name
ExtractFileName Extracts the name part of a full file name
ExtractFilePath Extracts the path part of a full file name
ProcessPath Split a drive/path/filename string into its constituent parts
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Example code : Extract all of the parts of a full file name
  fullFileName : string;

  // Set up a full file name with drive and path
  fullFileName := 'C:\Program Files\Borland\Delphi7\Projects\Unit1.dcu';

  // Show the component parts of this full name
  ShowMessage('Drive = '+ExtractFileDrive (fullFileName));
  ShowMessage('Dir   = '+ExtractFileDir   (fullFileName));
  ShowMessage('Path  = '+ExtractFilePath  (fullFileName));
  ShowMessage('Name  = '+ExtractFileName  (fullFileName));
  ShowMessage('Ext   = '+ExtractFileExt   (fullFileName));
Show full unit code
   Drive = C:
   Dir   = C:\Program Files\Borland\Delphi7\Projects
   Path  = C:\Program Files\Borland\Delphi7\Projects\
   Name  = Unit1.dcu
   Ext   = .dcu
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