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Abrindo arquivos com aplicativo associado

Código

//Inclua a unit SHELLAPI na clausula uses do seu form. 

procedure TForm1.ExecFile(F: String); 

var 

r: String; 

begin 

case ShellExecute(Handle, nil, PChar(F), nil, nil, SW_SHOWNORMAL) of 

ERROR_FILE_NOT_FOUND: r := 'The specified file was not found.'; 

ERROR_PATH_NOT_FOUND: r := 'The specified path was not found.'; 

ERROR_BAD_FORMAT: r := 'The .EXE file is invalid (non-Win32 .EXE or error in .EXE image).'; 

SE_ERR_ACCESSDENIED: r := 'Windows 95 only: The operating system denied access to the specified file.'; 

SE_ERR_ASSOCINCOMPLETE: r := 'The filename association is incomplete or invalid.'; 

SE_ERR_DDEBUSY: r := 'The DDE transaction could not be completed because other DDE transactions were being processed.'; 

SE_ERR_DDEFAIL: r := 'The DDE transaction failed.'; 

SE_ERR_DDETIMEOUT: r := 'The DDE transaction could not be completed because the request timed out.'; 

SE_ERR_DLLNOTFOUND: r := 'Windows 95 only: The specified dynamic-link library was not found.'; 

SE_ERR_NOASSOC: r := 'There is no application associated with the given filename extension.'; 

SE_ERR_OOM: r := 'Windows 95 only: There was not enough memory to complete the operation.'; 

SE_ERR_SHARE: r := 'A sharing violation occurred.'; 

else 

Exit; 

end; 

ShowMessage(r); 

end; 

//Utilize a função assim:

procedure TForm1.Button1Click(Sender: TObject); 

begin 

ExecFile('c:windowsladrilhos.bmp'); 

end;