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...get EXE path from window handle?
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uses
  
PsAPI, TlHelp32;
// portions by Project Jedi www.delphi-jedi.org/
const
  
RsSystemIdleProcess = 'System Idle Process';
  RsSystemProcess = 'System Process';

function IsWinXP: Boolean;
begin
  
Result := (Win32Platform = VER_PLATFORM_WIN32_NT) and
    
(Win32MajorVersion = 5) and (Win32MinorVersion = 1);
end;

function IsWin2k: Boolean;
begin
  
Result := (Win32MajorVersion >= 5) and
    
(Win32Platform = VER_PLATFORM_WIN32_NT);
end;

function IsWinNT4: Boolean;
begin
  
Result := Win32Platform = VER_PLATFORM_WIN32_NT;
  Result := Result and (Win32MajorVersion = 4);
end;

function IsWin3X: Boolean;
begin
  
Result := Win32Platform = VER_PLATFORM_WIN32_NT;
  Result := Result and (Win32MajorVersion = 3) and
    
((Win32MinorVersion = 1) or (Win32MinorVersion = 5) or
    
(Win32MinorVersion = 51));
end;

function RunningProcessesList(const List: TStrings; FullPath: Boolean): Boolean;

  function ProcessFileName(PID: DWORD): string;
  var
    
Handle: THandle;
  begin
    
Result := '';
    Handle := OpenProcess(PROCESS_QUERY_INFORMATION or PROCESS_VM_READ, False, PID);
    if Handle <> 0 then
      try
        
SetLength(Result, MAX_PATH);
        if FullPath then
        begin
          if 
GetModuleFileNameEx(Handle, 0, PChar(Result), MAX_PATH) > 0 then
            
SetLength(Result, StrLen(PChar(Result)))
          else
            
Result := '';
        end
        else
        begin
          if 
GetModuleBaseNameA(Handle, 0, PChar(Result), MAX_PATH) > 0 then
            
SetLength(Result, StrLen(PChar(Result)))
          else
            
Result := '';
        end;
      finally
        
CloseHandle(Handle);
      end;
  end;

  function BuildListTH: Boolean;
  var
    
SnapProcHandle: THandle;
    ProcEntry: TProcessEntry32;
    NextProc: Boolean;
    FileName: string;
  begin
    
SnapProcHandle := CreateToolhelp32Snapshot(TH32CS_SNAPPROCESS, 0);
    Result := (SnapProcHandle <> INVALID_HANDLE_VALUE);
    if Result then
      try
        
ProcEntry.dwSize := SizeOf(ProcEntry);
        NextProc := Process32First(SnapProcHandle, ProcEntry);
        while NextProc do
        begin
          if 
ProcEntry.th32ProcessID = 0 then
          begin
            
// PID 0 is always the "System Idle Process" but this name cannot be
            // retrieved from the system and has to be fabricated.
            
FileName := RsSystemIdleProcess;
          end
          else
          begin
            if 
IsWin2k or IsWinXP then
            begin
              
FileName := ProcessFileName(ProcEntry.th32ProcessID);
              if FileName = '' then
                
FileName := ProcEntry.szExeFile;
            end
            else
            begin
              
FileName := ProcEntry.szExeFile;
              if not FullPath then
                
FileName := ExtractFileName(FileName);
            end;
          end;
          List.AddObject(FileName, Pointer(ProcEntry.th32ProcessID));
          NextProc := Process32Next(SnapProcHandle, ProcEntry);
        end;
      finally
        
CloseHandle(SnapProcHandle);
      end;
  end;

  function BuildListPS: Boolean;
  var
    
PIDs: array [0..1024] of DWORD;
    Needed: DWORD;
    I: Integer;
    FileName: string;
  begin
    
Result := EnumProcesses(@PIDs, SizeOf(PIDs), Needed);
    if Result then
    begin
      for 
I := 0 to (Needed div SizeOf(DWORD)) - 1 do
      begin
        case 
PIDs[I] of
          
0:
            // PID 0 is always the "System Idle Process" but this name cannot be
            // retrieved from the system and has to be fabricated.
            
FileName := RsSystemIdleProcess;
          2:
            // On NT 4 PID 2 is the "System Process" but this name cannot be
            // retrieved from the system and has to be fabricated.
            
if IsWinNT4 then
              
FileName := RsSystemProcess
            else
              
FileName := ProcessFileName(PIDs[I]);
            8:
            // On Win2K PID 8 is the "System Process" but this name cannot be
            // retrieved from the system and has to be fabricated.
            
if IsWin2k or IsWinXP then
              
FileName := RsSystemProcess
            else
              
FileName := ProcessFileName(PIDs[I]);
            else
              
FileName := ProcessFileName(PIDs[I]);
        end;
        if FileName <> '' then
          
List.AddObject(FileName, Pointer(PIDs[I]));
      end;
    end;
  end;
begin
  if 
IsWin3X or IsWinNT4 then
    
Result := BuildListPS
  else
    
Result := BuildListTH;
end;

function GetProcessNameFromWnd(Wnd: HWND): string;
var
  
List: TStringList;
  PID: DWORD;
  I: Integer;
begin
  
Result := '';
  if IsWindow(Wnd) then
  begin
    
PID := INVALID_HANDLE_VALUE;
    GetWindowThreadProcessId(Wnd, @PID);
    List := TStringList.Create;
    try
      if 
RunningProcessesList(List, True) then
      begin
        
I := List.IndexOfObject(Pointer(PID));
        if I > -1 then
          
Result := List[I];
      end;
    finally
      
List.Free;
    end;
  end;
end;


 

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