You can open text files with the extensions .txt, .csv, and .tsv, and the text is converted to a data table. Files with the .dat extension that consist of text are also supported. Text files can be delimited using almost any character, or they can be fixed-width files.
When JMP finds an integer in the text file that is greater than 9,007,199,254,740,991, the column is considered character data. You can set the column to numeric using the Text Import Wizard window or an import script.
Select File > Preferences > Text Data Files to change the import settings so that JMP determines the best way to structure and format the data table.
1.
Select File > Open.
1.
Select File > Open.
2.
From the list next to File name, select Text Files.
(Optional) Select the Select this filter the next time this dialog is invoked option to apply the filter that you chose by default.
5.
Click Open.
Tip: The JMP Home window provides a shortcut to the above steps if you recently opened the file. Right-click the file in the Recent Files list and select Import (Preferences) or Import (Best Guess). (Your import preference is bolded in the right-click menu.)
1.
Select File > Open.
2.
From the list next to File name, select Text Files.
3.
Select Data with Preview next to Open at the bottom of the window.
5.
Click Open.
7.
Click Import.
1.
Select File > Open.
3.
From the Open As field, select Data (Best Guess) or Data (Using Preferences).
4.
Click Open.
1.
Select File > Open.
2.
Select the file that you want to open. From the Open As field, select Data (Using Preview).
3.
Click Open.
5.
Click Import.
Notes: 
On Windows, JMP can open text files in your computer’s default text editor. Select File > Open, and then select All Files (*.*) from the File name list. Select the text file, and then select Use default program to open. Uncheck to open as text.

Help created on 7/12/2018