I have created a TXT file about a week ago but am unable to remember the name I gave it. I would like to see if I can recover it by date now. I'm using Windows 10.
Assuming you are using Windows: start Explorer, choose a folder where to start searching (e.g., your user folder), enter "*.txt" into the search field in the upper right, switch to Details view and sort by modified date. This will show the most recent files of that type in the whole folder tree.
Similar steps apply in other OSes like MacOSX, Linux,...only the name of the file mangement tool varies.