1.startup zend studio.

2.go Help->software update->manage Configuration,in “Product Configuration” window.set “WYSIWYG PHP/HTML Editing feature 6.0 ” to disable.

3.go windows->proferences,General -> Editor->File Associations,
choose
(*.html) . (*.htm) Aptana Html Editor
(*.js) Aptana JS Editor
(*.css) Aptana CSS Editor.

4.restart Zend Studio.