Index.dat

Martin Brinkmann
Jan 4, 2009
Updated • May 9, 2012
Software, Windows
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6

A recent analysis of index.dat files on a Windows XP Service Pack 3 test system revealed hundreds of entries. Index.dat files are hidden files that contain information about visited urls, cookies and other cache related files. The information are only recorded when Microsoft's Internet Explorer is being used to browse the Internet. What many users do not realize is that data is also recorded if a software program makes use of the Internet Explorer rendering engine.

A few software programs are available to view and delete the contents of index.dat files. We have mentioned some of them earlier here at Ghacks like the index.dat viewer or the index.dat suite. Another tool for the purpose is the index.dat analyzer which can display and clean the contents of index.dat files as well.

Even if you do not suspect that the files will contain private information, it may make sense to verify that assumption, by running one of the programs to analyze the index.dat files on your computer.

When you first run the program you are asked to scan your system for index.dat files. Once the files have been located, the program switches to a new interface where you can analyze individual files. What you then see are all the information that are stored in the selected index.dat file, including cookies, the files that you have downloaded, and websites that you have visited in the past.

If you want to prevent that Windows is writing data to those files in future sessions you need to set the file attribute to read-only. Another possibility would be to run CCleaner regularly (this can be automated) to clean the index.dat files.

Update: Index.dat Analyzer is fully compatible with 32-bit and 64-bit editions of the Windows 7 operating system. The website has not been updated to reflect that change.

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Comments

  1. Anonymous said on March 9, 2023 at 1:52 pm
    Reply

    Does it come back after every “moment” update?

  2. Baloney said on March 9, 2023 at 2:23 pm
    Reply

    Yeah right.. Like this is going to stop defender from running =) This is comedy gold right here.

  3. Anonymous said on March 9, 2023 at 3:25 pm
    Reply

    no ‘about the author’ paragraph?

  4. Gregory said on March 9, 2023 at 4:19 pm
    Reply

    For permanent disable defender is if removed complete from system no just change permission folder.

    Just this is joke.

  5. moi said on March 9, 2023 at 5:57 pm
    Reply

    simpler, load Autoruns (SysInternals)
    – filter “Defender”
    – untag all entries
    – reboot
    nothing has changed since my 1st modification years ago

  6. John G. said on March 9, 2023 at 6:32 pm
    Reply

    I wouldn’t disable Defender imho, it has too many hidden roots inside Windows itself. One time I tried to uninstall it using brute force scripts and then the Onedrive feature stopped working definitely. A reinstallation was needed and since those times I prefer to maintain Defender untouched. It’s a better method to install another antivirus and it will disable Defender in a safer and easier mode (e.g., Avast is the best in this way, and also Panda Cloud Free is good too).

  7. boris said on March 10, 2023 at 12:19 am
    Reply

    You can not stop defender from running in background or remove it without some penalty. All you can do is to limit telemetry.

    1. TelV said on March 10, 2023 at 4:52 pm
      Reply

      @borts,

      It’s probably Smartscreen which is preventing WD from being disabled. Get rid of that and the problem should be solved: https://thegeekpage.com/disable-windows-defender-smartscreen/#How_to_disable_the_Windows_Defender_SmartScreen_via_Local_Group_Policy_Editor

  8. hoho said on March 10, 2023 at 1:47 pm
    Reply

    Remove Windows and go for Linux.

    1. basingstoke said on March 10, 2023 at 2:51 pm
      Reply

      Linux sucks dude. Besides it’s not comparable to Windows, these OSes are in different classes entirely.

      1. Derp said on March 10, 2023 at 4:36 pm
        Reply

        I use Linux as my daily driver. It’s far more stable than Windows. When’s the last time you used Linux, 2010?

      2. Bromosexual said on March 11, 2023 at 2:04 am
        Reply

        @basingstoke

        You’re right, dude. Bro, linux is just a bunch of code that starts before the OS, dude. Brobrodude, that shit ain’t even got emojis, dudebrodudeman! Dudebro, it’s no way near as cool as Windows with its hardcoded abilities to make money off the user, bro. Yo brodude man, you’re the coolest dude ever man, bro. Dude.

      3. basingstoke said on August 16, 2023 at 7:20 pm
        Reply

        Lol what? Windows 7 doesn’t come with any Emojis

  9. TelV said on March 10, 2023 at 4:46 pm
    Reply

    Download Autoruns and remove the checkmark from Windows Defender. It doesn’t remove it, but it will never run. https://learn.microsoft.com/en-us/sysinternals/downloads/autoruns

  10. Simon said on March 10, 2023 at 8:37 pm
    Reply

    Just use “Defender Control”:
    https://www.sordum.org/9480/defender-control-v2-1/comment-page-1/#comments

    Per this video,
    https://www.youtube.com/watch?v=CLIjr7FyxZ8
    it also works on Windows 11 too…

  11. Someone said on March 10, 2023 at 9:26 pm
    Reply

    Win Defender, is completly the most succesful free-built in antivirus of Microsoft. Really nice product. Saved my ass a lot of times. Has updated malware database, completly strong defence
    from whatever smart screen disables. Or if you want better and more upgrated (paid) program,
    you can go further. But defender is always on your side.

  12. CalixtoWVR1 said on March 10, 2023 at 10:03 pm
    Reply

    Why would one disable Windows (or Microsoft) Defender in the first place?. I consider this to be playing with fire big time. Everybody knows that if one is using another A-V, Defender will be disabled on its own and won’t be in one’s way.

  13. Ed D said on March 10, 2023 at 11:09 pm
    Reply

    Why would I want to disable Windows Defender in the first place? It’s a great anti virus in my opinion. Been using it since Windows 8 and and never had a problem or a virus. Why mess with a good thing, if it ain’t broke don’t fix it.

  14. owl said on August 17, 2023 at 1:57 am
    Reply

    How a ridiculous article!
    I am thoroughly stunned.

    Why Should You Disable First-Party Windows Defender?
    I can only think that it is “malice or perversely intention (want you to buy a third-party AV where you can expect a back margin)” to guide invalidation without showing the premise.
    No sane company will use third-party closed source programs (such as AV).

    As I thought, “Ghacks Technology News” seems to be coming to downfall.

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