What are you trying to do you the file?
You need to use the binary from the Upload widget somehow.

 It's a text file.

I need to extract the text content to do something like to show in a view.

Perhaps I could store the file to avoid upload the same file every time.

Avoid the upload? If the information is always the same, you shouldn't use a file at all! That kind of info should already be in the server.

I´ve tried to put the file in resources folder before, but I cannot retrieve it. It´s a XML file.  This file is for test purposes. 

The file name is teste.xml. In the preparation of the webscreen I tried to to retrieve the file content using File_ReadText (the path is "Resources.teste_xml") but I got an Exception.

The exception:

"Access to the path 'c:\windows\system32\inetsrv\teste.xml' is denied."

In the webpage appears the following message:

File_ReadText is the right function and resources seems a good ideia, but you can't open files from that directory. They are protected.

Try to use a folder far away from system files. If you have a d: drive, use it. There you can write and read as you want.

I think 'c:\windows\system32\inetsrv\' is a Outsystems server directory. It´s not in my local computer.

How could I put the file in other directory and retrieve it?

If you are using the Personal Environment, you can't access any folder.
You can only write to database and so you must upload and save to database as binary. The Forum and Forge have several examples.

Use the Upload widget, that will give you the file as a Binary object.
From there, you can put it into the database with an Entity with a binary attribute, and later get the binary from database and work it with several of the File functions.