Why is Dreamweaver adding special characters in a hyperlink (e.g. the percent sign)?

Why is Dreamweaver adding special characters in a hyperlink (e.g. the percent sign)?

Remove the setting to encode special characters in URLS using %. Select Preferences from the Edit menu. In the Code Rewriting (Dreamweaver 4) or HTML Rewriting (Dreamweaver 3) category, disable this selection.