When I try to save a file without an extension, “.txt” will be added automatically. How do I prevent an extension from being added to the file name?

Surrounding the file name with quotation marks ("") will prevent an extension from being appended. For example, "file" will just be saved as file instead of file.txt.

Can I open GB18030 files?

Yes. First, go to Define Encodings on the Tools menu, click New and select GB18030 in the Encoding drop-down list. When you open a file, make sure you select this new defined encoding.

Internet Explorer terminates when I view source of a local HTML file and then save the file.

On Windows XP, this issue appears when the Use Recycle Bin to Backup check box is checked in the Backup tab of configuration properties. Please clear the Use Recycle Bin to Backup check box.