Files with blf file extension are commonly found as temporary files generated by latest Windows operating system to prevent registry corruption whenever a change to registry is done.

There are 4 other file types using
the BLF file extension!

empty icon.blf - Beast Trojan data

empty icon.blf - Advanced Computer Architecture Car Simulation data

empty icon.blf - Rally Online car texture

empty icon.blf - MasterWorks working design

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BLF file extension - Microsoft Windows registry data file

What is blf file? How to open blf files?

File type specification:

System file type icon System file type

Temporary file type icon Temporary file type

blf file icon: blf filetype icon

The blf file extension used by Microsoft Windows operating system for desktop as well as Server editions for temporary files, that store changes in registry. Also known as CLFS (Common Log File System), a Windows component.

The blf 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 .blf file, before being written to the real file NTuser.dat, that contains users registry data.

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

Typically located in User account folder.

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

The default software associated to open blf 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 Microsoft Windows 11.

Help how to open:

These files are not meant to be opened and edited manually. They are used to prevent registry corruption.

How to convert:

Conversion to other formats is not possible.

List of recommended software applications associated to the .blf 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 blf file, edit blf file, convert blf file, view blf file, play blf file etc. (if exist software for corresponding action in's database).

Unspecified and all other actions for computer programs working with blf file - Microsoft Windows registry data file

Click on the software link for more information about Microsoft Windows. Microsoft Windows uses blf 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:

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