Hi Josimar José Nepomuceno ,
You can use custom java action to read text files and save it in some entities then later you can the data for further purposes
Another option, depending on file size, is to create non-peristant entity with a text box, then cut and paste the day and use a micro-flow and the Community Commons Split function.
i have done this a few times and it works well enough.
Thanks for the answer Narayana Moorthy, do you have any external mendix module that does txt file import without java action?