Windows NT Registry File (REGF)

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Microsoft Windows NT 4 (and later) uses the Windows NT Registry File (REGF) to store system and application related data, e.g. configurations, most recently used (MRU) files.

Contents

MIME types

File signature

REGF has the following file signature:

hexadecimal: 72 65 67 66

ASCII: regf

File types

There are multiple types of REGF files:

  • normal (data) file
  • transaction log file

In Vista the Transactional Registry (TxR) was introduced. TxR creates transaction log files similar to:

  •  %FILE%{%GUID%}.TM.blf
  •  %FILE%{%GUID%}.TMContainer00000000000000000001.regtrans-ms
  •  %FILE%{%GUID%}.TMContainer00000000000000000002.regtrans-ms

Contents

The REGF basically consists of a set of hive bins. These hive bins contain cells that make up a hierarchy of keys and values.

See also