What index.dat actually was
Internet Explorer stored its history, cookies, and typed URLs not in loose files but in structured index.dat databases scattered through the user profile — inside the Temporary Internet Files, History, and Cookies folders. Each site you visited got an entry, entries survived "deleting history" from the browser, and the files were held open by the operating system, so a manual delete returned an in-use error. They also grew without a ceiling, which is how a machine with a small disk ended up with hundreds of megabytes of a log nobody asked for. For forensic tools and anyone with physical access, index.dat was a perfect record: browsing history that believed you had deleted it.
What Windows keeps today instead
Internet Explorer was finally switched off in February 2023, and the old index.dat files are largely history on any Windows 10 or 11 machine. The habit of recording, though, moved to new places:
- WebCache (WebCacheV01.dat): an ESE database under %LOCALAPPDATA%\Microsoft\Windows\WebCache that still archives IE and legacy-Edge history
- Jump lists and Recent items: the taskbar's right-click menus record which files each program opened, in files most cleaners never touch
- Thumbs.db and the thumbnail cache: a visual index of what your picture folders contain, including the images you deleted
- The SRU database: Windows' own usage log — applications, network connections, even how long each ran
- AmCache: an inventory of every program that executed, with timestamps, kept for troubleshooting and happily read by forensic tools
What deleting browser history actually removes
Clearing history inside Chrome, Edge, or Firefox deletes that browser's own databases and nothing else — the OS-level artifacts above keep their records, and they are the ones someone with the disk would actually read. Private or InPrivate mode keeps these traces thinner but not zero: the system still logs the executable, and a jump list may still record the download. If the threat model is a stranger inheriting the machine, deleting history is the smallest possible gesture; the real answer is a full wipe of the drive before it changes hands. If the threat model is everyday privacy, the practical step is knowing which artifacts your cleanup tool actually touches — many still advertise index.dat, a file that no longer exists, while ignoring the databases that replaced it.
Questions and Answers
Does index.dat still exist in Windows 10 and 11?
As a meaningful privacy problem, no — Internet Explorer was disabled in February 2023, and the old files survive only on upgraded machines with leftover data. The function moved to WebCache, jump lists, and the SRU database.
Can you delete index.dat files?
Not while the owning process holds them open — that lock was the whole business model of early cleaners. On a modern machine you are better off removing leftover IE data wholesale than hunting individual locked files.
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