File Extension SPY File Format SEO SpyGlass project file SPY stands for SEO SpyGlass project file. This was last updated in March 2012 By Margaret Rouse Browse File Extensions Alphabetically: A B C D E F G H I J K L M N O P Q R S T U V W X Y Z # Ask a Question. Find an Answer. Ask your peers a question about this file extension. Ask a Question Google and Yahoo are adding search capabilities for flash files web search using specified url list Which is better: Fast-Tracking and Crashing?