Windows Search indexes the Tor Browser Bundle
A forensic analysis of the Tor Browser Bundle (version 2.3.25-6, 64-bit) on Windows 7 showed that it is likely that Windows Search indexes the Tor Browser Bundle.
Windows Search, which is enabled by default, builds a full-text index of files on the computer. One component of Windows Search is the Indexer, which crawls the file system on initial setup, and then listens for file system notifications to index changed files. Windows Search writes a number of files to the following location:
I have not found a way to read the Windows Search database files, but I would say it is likely that Windows Search picked up the Tor Browser Bundle at some point.