After some further Googling with a more exact search phrase, I found this link which points to the answer.
Select the cell where the first line of text from the file should be.
Use the
Data
/Get External Data
/From File
dialog to select the text file to import.Format the imported text as required.
In the
Import Data
dialog that opens, click onProperties...
Uncheck the
Prompt for file name on refresh
box.Whenever the external file changes, click the
Data
/Get External Data
/Refresh All
button.