user profile (if profiles are enabled) has its own USER.DAT file which is located in the user's profile directory in %WINDIR%\Profiles\<Username>\. Windows 3.11 The only registry file is called REG.DAT and it is stored in the %WINDIR% directory. Windows 10 Mobile Note: To access the registry files, the Phone needs to be set in a special mode using either: WpInternals ( Put the mobile device into flash mode. ) InterOp Tools ( mount the MainOS Partition with MTP. ) If any of above Methods worked - The Device Registry Files can be found in the following location: {Phone}\EFIESP\Windows\System32\config Note: InterOp Tools also includes a registry editor. Editing Registry editors The registry contains important configuration information for the operating system, for installed applications as well as individual settings for each user and application. A careless change to the operating system configuration in the registry could cause irreversible damage, so it is usually only installer programs which perform changes to the registry database during installation/configuration and removal. If a user wants to edit the registry manually, Microsoft recommends that a backup of the registry be performed before the change. When a program is removed from control panel, it may not be completely removed and, in case of errors or glitches caused by references to missing programs, the user might have to manually check inside directories such as program files. After this, the user might need to manually remove any reference to the uninstalled program in the registry. This is usually done by using RegEdit.exe. Editing the registry is sometimes necessary when working around Windows-specific issues e.g. problems when logging onto a domain can be resolved by editing the registry. Windows Registry can be edited manually using programs such as RegEdit.exe, although these tools do not expose some of the registry's metadata such as the last modified date. The registry editor for the 3.1/95 series of operating systems is RegEdit.exe and for Windows NT it is RegEdt32.exe; the functionalities are merged in Windows XP. Optional and/or third-party tools similar to RegEdit.exe are available for many Windows CE versions. Registry Editor allows users to perform the following functions: Creating, manipulating, renaming and deleting registry keys, subkeys, values and value data Importing and exporting .REG files, exporting data in the binary hive format Loading, manipulating and unloading registry hive format files (Windows NT systems only) Setting permissions based on ACLs (Windows NT systems only) Bookmarking