All search engines

I'm not sure if I'm in the right place to ask this, and if not, point me to the correct Stack Exchange site.

An NTFS file system search engine called "Everything" can be downloaded from http://www.voidtools.com/ and because it works so well I got curious about which programming language was written.

I have searched the aforementioned site forums and google without success .. I understand that the application is private free and therefore I cannot get the source code. However, I have never heard of any applications where information about what language it is written in is hidden.

So my question is: What language was "Everything" written in?