For the record, I think that double clicking triggers whatever operation is the default. Usually that's 'open', but not necessarily.

>Alessio,
>
>I think Borislav has hit it. double clicking a file in explorer triggers the "open" operation not the "edit" operation you are asking it to do in your shellexecute() call.
>
>Either change your call to open, or make sure the edit option on the file type is set to the program you want.
>
>>It works fine
>>The file is opened by MSPAINT
>>>What happend if you double click on that file in Windows Explorer (there where your ShellExecute not working)?
>
>>>>>> result = ShellExecute(0, 'Edit', xFileToOpen , '', xLocation, 1)