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By default, IdentityFinder will scan over 200 of the most common file types. It has a built-in processor to read and search through each one. You can also set IdentityFinder to search on all files on the computer, using a processor if it has one for that filetype, and using a plain-text search for other files. This will lead to a very thorough search, though it's still possible that proprietary applications choose to encode their data files in a way that is not searchable at all (if you have such an application, you'd have to open it up and examine the file in question by hand in order to determine whether it has PI).
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