After you have selected your file you may be prompted to save your existing document; all existing data is cleared during File | Open. In addition, you may be prompted with an Import Options dialog box specific to the file type chosen.
Files of Types (Combo Box):
This combo box shows a list of supported file types. You can add and remove items from this list using the Import Setup dialog in the Module - Setup Menu.
You can also add a new format from within the File-Open dialog box:
1. Select "Add a new file format...(*.*)" in the Files of Type Combobox.
2. Select a file in the "File Name" list, and press the Open button.
4. Press the New Format button to pop-up the Import Setup dialog. This will show a complete list of file formats available, and allow you to add and remove file formats.