1CD File

What are 1CD files and how to open them

Are you having problems opening a 1CD file or are you simply curious about its contents? We're here to explain the properties of these files and provide you with software that can open or handle your 1CD files.

What is a 1CD file?

A .1CD file is a 1C Data Base file.

1C Data Base (.1CD) is a binary database file used by the 1C:Enterprise 8 platform created by 1C Company. 1C:Enterprise uses this file format when running in "file mode" (non-client/server). The .1CD file can store an entire "infobase" - both the configuration (metadata: tables, fields, indexes) and the actual business data (records, unlimited-length fields etc.). Administrators often distribute .1CD files either empty or prepopulated with demo or starter data.

The file is created and updated by the internal DBMS built into 1C:Enterprise when the infobase is used in file mode. Programs use it directly; when users modify data via the 1C user interface (or via Designer), the changes get written into this .1CD file. The file supports multiple internal tables, each mapped to up to four "internal files" inside the .1CD - one for the table schema, one for data (excluding unlimited-length fields), one for indexes if any are defined, and one for unlimited-length fields if present.

Internally, the .1CD file is page-based. Pages are 4096 bytes (4 KB) each, and the total file size is always a multiple of that. The file begins with a signature "1CDBMSV8" at offset 0, identifying it as a version-8 1C file database; internal "object" structures start with a signature "1CDBOBV8".

How to open 1CD files

Important: Different programs may use files with the 1CD file extension for different purposes, so unless you are sure which format your 1CD file is, you may need to try a few different programs.

We have not yet verified any programs for Windows that work with this specific file format. If you know one, please use the 'Suggest a program' link below. Thanks!

Last updated: August 14, 2026

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