I'm sorry, but your question is not clear. What do you mean that you write the name of the file? Write it where? And what do you mean by "find the file"? Are you referring to having a path control on the front panel? Your question's topic seems to imply that you want a hyperlink control?
Please be more descriptive. Perhaps an example VI showing what you want to do may make things clearer. If that fails, post your question in your native language and someone can try to translate it, or you can try Google Translate.