Files with .regtrans-ms file extension can be found as special temporary files for registry changes done by the user in Windows Vista and later versions. This dynamic mechanism is in place to prevent system registry corruption.

Detailed description

Software that open regtrans-ms file

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REGTRANS-MS file extension - Microsoft Windows registry changes temporary data

What is regtrans-ms file? How to open regtrans-ms files?

File type specification:

System file type icon System file type

Temporary file type icon Temporary file type

regtrans-ms file icon: regtrans-ms filetype icon

The regtrans-ms file extension used by Microsoft Windows for desktop and servers for temporary files, that store changes in registry.

Typically, regtrans-ms files are created dynamically to prevent the registry becoming corrupt. Basically whenever user make a setting change, it will be written to a temporary created regtrans-ms file, before being written to the real file NTuser.dat, that contains users registry data. They are usually located in User account folder.

regtrans-ms file location:


The purposes is to create a recovery option, should something go wrong and avoid possible registry corruption.

Same basically goes for blf format as well, it is often found in the same place as regtrans-ms.

Updated: July 14, 2022

The default software associated to open regtrans-ms file:

Microsoft Windows icon

Microsoft Corporation logoMicrosoft Windows  Microsoft Windows software

Company or developer:
Microsoft Corporation

A family of operating systems developed by the Microsoft Corp. The first Windows was released in 1985 as a GUI add-on to MS-DOS.  MS-DOS based Windows versions were developed to 2000, when was released the last version called Windows ME. Windows based on NT core started in 1993. Windows NT family are developed to these days, the latest version is called Windows 10.

Help how to open:

You can edit registry entries with a text editor. However, these are just temporary files with changes, so there is kinda no point in changing them.

How to convert:

Registry files are not meant to be converted to anything else, at best you can edit them.

List of recommended software applications associated to the .regtrans-ms file extension

Recommended software programs are sorted by OS platform (Windows, macOS, Linux, iOS, Android etc.)
and possible program actions that can be done with the file: like open regtrans-ms file, edit regtrans-ms file, convert regtrans-ms file, view regtrans-ms file, play regtrans-ms file etc. (if exist software for corresponding action in's database).

Unspecified and all other actions for computer programs working with regtrans-ms file - Microsoft Windows registry changes temporary data

Click on the software link for more information about Microsoft Windows. Microsoft Windows uses regtrans-ms file type for its internal purposes and/or also by different way than common edit or open file actions (eg. to install/execute/support an application itself, to store application or user data, configure program etc.).

Microsoft Windows:

Main software associated with regtrans-ms file by default:
Microsoft Windows small icon Microsoft Windows
Other suggested software:
Microsoft Windows 10 small icon Microsoft Windows 10
Microsoft Windows 8 small icon Microsoft Windows 8
Microsoft Windows 7 small icon Microsoft Windows 7
Microsoft Windows Vista small icon Microsoft Windows Vista
Microsoft Windows Server small icon Microsoft Windows Server

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