Select Data from the pull-down menu bar, and choose Import. The File Name box lists all the files in the current directory. If you want to locate files with a particular extension (e.g. *.DAT), click in the File Name box and type the file type. The Directories box shows all the directories as a directory tree. It defaults to your current directory. To switch among directories, double click on the icons. To switch to another disk drive, select the drive in the Drives box.
When you find the data file you want to import, double click on the file name, or click once on the name to select it, then click the OK button. The default import header will appear. Do not edit this header. Since you have created a separate header file, you will need to use the Load Button to load the import header file.