Posted on 2004-11-17
Last Modified: 2008-01-09

I'm having a problem with a roaming profile (netware), once the .dat file gets to a certain size windows XP fails to create the profile :-(
I have two version of the .dat file and would like to compare them to see what's been added since the last time it successfully loaded (which i'm told is nothing!).
Can anyone tell me of a utility that will compare two ntuser.dat files, or suggest any other advice, i could restore the old .dat file and it'll work for months but then it happens again, so i just like to know why :-)


Question by:jeffw1

    Author Comment


    I've found a tool that converts ntuser.dat to .reg files and have now compared the two .reg files for differences.


    LVL 50

    Accepted Solution

    Just for interest sake you can load a .DAT file into your registry using REGEDIT. (Regedt32 on older machines)

    From the registry menu select Load Hive and browse to where the .DAT file is located. You will be asked for a name for the loaded hive afterwhich the registry information in the .DAT will be loaded into your registry under the key of the same name.

    You can then access this key in exactly the same way as any other part of your registry.

    Important: always remember to unload the hive. If you load a production .DAT and don't unload it - the profile it belongs to will not be able to load.


    Author Comment

    Thanks for the info, i've never known how to do that either.

    I used Registry File Viewer ( to convert to .reg files then compared the .reg files with compareit (

    I'll give my points to julianh as it'll close the solution.



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