Chad Egeland

Matt Cutts of Google, Sphinn and SEO Roundtable are all reporting on what can only be described as an algorithmic slap that could and probably will have your pages deindexed from the Google serps if they ever had made it in to the serps to begin with. Pages that end in extensions such as .exe, .zip, .0 etc…are explained the following way by Matt Cutts

“But there are some file extensions that are mostly binary data, such as .exe, where the vast majority of the time the data would be meaningless blobs, so there are a few extensions to avoid. If your files are named example.dll or example.bin and you don’t see Google crawling pages with that file extension, I’d recommend changing your file extension to something else.”

This makes sense as Google would not want to index pages that do not add any value to the user. There is a simple way to check to see if a file type would be indexed by Google. Using the following command when searching from Google filetype:dll will return any page that ends in the .dll extension. If nothing returned ends exactly with the .dll extension it means Google is not indexing those file extension types.

So the best thing to do is to end your urls with a backslash or a common file type such as .html, .htm, .php. .cfm etc… as this will ensure your pages will be indexed and eventually ranked by Google.