Короткое имя файла в длинное и наоборот, сокращённое имя файла

{=========================================================} 
Function Mince(PathToMince: String; InSpace: Integer): String; 
{=========================================================} 
// "C:\Program Files\Delphi\DDrop\TargetDemo\main.pas" 
// "C:\Program Files\..\main.pas" 
Var 
  sl: TStringList; 
  sHelp, sFile: String; 
  iPos: Integer; 

Begin 
  sHelp := PathToMince; 
  iPos := Pos('\', sHelp); 
  If iPos = 0 Then 
  Begin 
    Result := PathToMince; 
  End 
  Else 
  Begin 
    sl := TStringList.Create; 
    // Decode string 
    While iPos <> 0 Do 
    Begin 
      sl.Add(Copy(sHelp, 1, (iPos - 1))); 
      sHelp := Copy(sHelp, (iPos + 1), Length(sHelp)); 
      iPos := Pos('\', sHelp); 
    End; 
    If sHelp <> '' Then 
    Begin 
      sl.Add(sHelp); 
    End; 
    // Encode string 
    sFile := sl[sl.Count - 1]; 
    sl.Delete(sl.Count - 1); 
    Result := ''; 
    While (Length(Result + sFile) < InSpace) And (sl.Count <> 0) Do 
    Begin 
      Result := Result + sl[0] + '\'; 
      sl.Delete(0); 
    End; 
    If sl.Count = 0 Then 
    Begin 
      Result := Result + sFile; 
    End 
    Else 
    Begin 
      Result := Result + '..\' + sFile; 
    End; 
    sl.Free; 
  End; 
End; 

{===================================================} 
Function ShortFileName(Const FileName: String): String; 
{===================================================} 
Var 
  aTmp: Array[0..255] Of Char; 

Begin 
  If Not FileExists(FileName) Then 
  Begin 
    Result := ''; 
  End 
  Else 
  Begin 
    If GetShortPathName(PChar (FileName), aTmp, Sizeof (aTmp) - 1) = 0 Then 
    Begin 
      Result:= FileName; 
    End 
    Else 
    Begin 
      Result:= StrPas (aTmp); 
    End; 
  End; 
End; 

{==============================================} 
Function LongFileName(ShortName: String): String; 
{==============================================} 
Var 
  SR: TSearchRec; 

Begin 
  Result := ''; 
  If (pos ('\\', ShortName) + pos ('*', ShortName) + 
      pos ('?', ShortName) <> 0) Or Not FileExists(ShortName) Then 
  Begin 
    { ignore NetBIOS name, joker chars and invalid file names } 
    Exit; 
  End; 
  While FindFirst(ShortName, faAnyFile, SR) = 0 Do 
  Begin 
    { next part as prefix } 
    Result := '\' + SR.Name + Result; 
    SysUtils.FindClose(SR);  { the SysUtils, not the WinProcs procedure! } 
    { directory up (cut before '\') } 
    ShortName := ExtractFileDir (ShortName); 
    If length (ShortName) <= 2 Then 
    Begin 
      Break;  { ShortName contains drive letter followed by ':' } 
    End; 
  End; 
  Result := ExtractFileDrive (ShortName) + Result; 
end;