Multiple ways to do this.
My preferred method is to use a FeatureReader (Directory and File Pathnames) to find the files I need followed by another FeatureReader (Text File), using the path_windows attribute to read the selected files.
As an alternative you can add a classic Text File reader and choose for the "Select Multiple Folders/Files..." option from the Dataset options.
Thanks for that. FeatureReader works for me. Now I am able to read thousands of txt files by using FeatureReader 👍 Much appreciated!