.BK1 File Extension

File Type:
Autodesk Backup File

Having trouble opening .bk1 extension? Don't panic! This page explains what bk1 files are as well as suggests programs you may use to open bk1 files. You can download these programs through this page.

What is a BK1 file?

Bk1 file extension has Autodesk Backup file type, developed by Autodesk, which is associated with the "backup files" category.

These are backups files created by some products from the Autodesk family: AutoCAD Map, AutoCAD Mechanical, and Mechanical Desktop. BK1 files are in fact .BAK files that got automatically renamed when one of the mentioned Autodesk programs crashed. BAK files are also created automatically when user decides to save his drawing files. When your session terminates unexpectedly due to an error, Autodesk software renames a saved BAK file and makes it a BK1 file, so the broken drawing file cannot replace the original backup. If there is already a BK1 file in the folder, Autodesk will use the ".bk2" extension, then ".bk3", and up to ".bk9". The same rule applies for ".bka"-".bkz" and ".baa"-".bzz" extensions.


To learn how you can open the given file, read the information below.

bk1 file icon
File Type:
Autodesk Backup File
Backup Files

How to open BK1 file?

Double click the bk1 file to open it. The file will open automatically if file associations have been correctly installed and there is a proper program on your computer; if not, file associations may be corrupted and your OS either cannot find the proper program, or you might not have one for opening the file. First, we recommend downloading our utility to fix file association errors; then, you can download any program for opening the .bk1 extension from the ones suggested below. If you are certain there is nothing wrong with the file associations, you may proceed to method 2 right away; besides, if you can't make up your mind when choosing the right program, use Universal File Viewer from the last method.

Method 1: Fix file association errors

Follow these steps in order to automatically fix the bk1 extension associations' problem in no time:

  • Step 1: Click on "Download Solution" to download automatic tool provided by WikiExt.
  • Step 2: Click "Start Scan" to identify all potential issues.
  • Step 3: Review scan results and click "Fix Items".

File Size: 3.04 MB, Download time: < 1 min. on DSL/ADSL/Cable

This Tool is Compatible With: Windows XP, Vista, 7, 8/8.1, 10

Method 2: Download the appropriate software

The given list provides programs which may be used for opening or converting the bk1 file. Choose the proper program for your OS, and click it to start the download or proceed to the developer's website.

Programs that open BK1 files

Method 3: Use universal file viewer

In addition to the list of programs above, we recommend using Universal File Viewer. This tool can open over 250 file extensions and, most likely, it will be able to open the bk1 file as well. Download Universal File Viewer for your OS.

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