Corel WordPerfect document backup
File type: Backup file
A bk1 file is a backup copy of a document created by Corel WordPerfect.
Found 8 different file type records with the same bk1 filename suffix.
File type category:
Backup file
Date updated: October 12, 2026
The bk1 file extension is associated with Corel WordPerfect, a word-processing program developed by Corel Corporation. It was also included with the Corel WordPerfect Office suite.
Earlier versions of Corel WordPerfect used bk1 files to store document backups. The file contains a backup copy of the document rather than being the primary working document. This is a legacy backup format associated with Corel WordPerfect for Microsoft Windows.
Open the bk1 file with Corel WordPerfect on Microsoft Windows. In the Open dialog, select the option to show all files if the backup is not listed automatically.
Work from a copy of the backup when possible, so the original remains available if recovery is unsuccessful.
A bk1 file is not normally converted directly. If Corel WordPerfect can open the backup, use its Save As or export function to save the recovered document in a current WordPerfect document format or another format supported by the program.
Software apps that recover bk1 files:
Microsoft Windows
Software applications that handle other tasks involving bk1 files:
Microsoft Windows
File type category:
Various data file
Date updated: October 12, 2026
The bk1 file suffix identifies a backup file created by Aspen HYSYS, a process modeling and simulation program developed by Aspen Technology for Microsoft Windows.
The bk1 file stores a backup copy of data used by Aspen HYSYS. It is intended to support recovery of HYSYS work rather than serve as a general-purpose, independently editable document.
Use Aspen HYSYS on Microsoft Windows to work with a bk1 file. Open or restore it through the program's file and recovery functions, if the installed version recognizes the backup.
A bk1 file is a backup rather than a format intended for general conversion, so dedicated conversion tools are not normally available. Use Aspen HYSYS to restore the backup and save the recovered data in the program's regular case or project format, where supported.
Software apps that create bk1 files:
Microsoft Windows
Software apps that recover bk1 files:
Microsoft Windows
File type category:
Backup file
Date updated: June 19, 2019
The bk1 file extension is associated with the Autodesk AutoCAD 2D and 3D CAD suite for Microsoft Windows and Mac OS X operating systems.
The bk1 file contains backup of the AutoCAD project.
Use AutoCAD to open *.bk1 files.
Probably can be converted to other formats.
Software applications that can open bk1 files:
Microsoft Windows
Apple macOS / Mac OS X
Software apps that create bk1 files:
Microsoft Windows
Apple macOS / Mac OS X
Software apps that backup bk1 files:
Microsoft Windows
Apple macOS / Mac OS X
Software apps that recover bk1 files:
Microsoft Windows
Apple macOS / Mac OS X
File type category:
Backup file
Date updated: May 4, 2019
Record marked as obsolete and not updated for a long time.
The bk1 file extension is associated with the CA ERwin Data Modeler.
The bk1 file contains backup of the CA ERwin Data Modeler project.
Most likely some old format without support. No further information could be found.
Use compatible tools to work with *.bk1 files.
Probably cannot be exported to other formats.
Software applications that can open bk1 files:
Microsoft Windows
Software apps that create bk1 files:
Microsoft Windows
Software apps that backup bk1 files:
Microsoft Windows
Software apps that recover bk1 files:
Microsoft Windows
File type category:
Backup file
Date updated: October 12, 2026
The BK1 file extension is associated with FlashGet, an Internet download manager developed by Trend Media. FlashGet runs on Microsoft Windows.
A BK1 file stores a backup of the FlashGet database. The database retains the application's download-related data, while the BK1 file provides a backup copy for recovery.
This is a proprietary backup format intended for FlashGet rather than a general-purpose database format. It may require FlashGet, or a compatible version, for recovery.
Open the BK1 file with FlashGet on Microsoft Windows. It is a database backup, not a regular document, so it may not display useful content when opened in a text editor or another database program.
Use FlashGet's database recovery or restore function, if available, to recover data from the backup. Make a copy of the original file before attempting recovery.
The FlashGet BK1 format is intended to be restored by FlashGet rather than converted to another file format.
If the data must be moved to another application, restore the backup in FlashGet first and then use any export options provided by that installation. Do not rename a BK1 file to create a different database format.
File type category:
Various data file
Date updated: December 30, 2024
The bk1 file extension is associated with the Microsoft Windows operating system for IBM-PC computers.
The *.bk1 file stores some kind of data used by Indexing Service included in the Microsoft Windows.
Software applications that handle other tasks involving bk1 files:
Microsoft Windows
File type category:
Various data file
Date updated: September 27, 2026
Orgadata LogiKal is a Microsoft Windows application from Orgadata used for the design, calculation and planning of window, door and facade projects. A BK1 file is part of this application's data.
The file uses a LogiKal-specific format and may contain information required by the application for a project or another internal LogiKal operation. Its exact contents depend on how LogiKal created and uses the file.
BK1 is not a general-purpose interchange format, so the file should be handled with a compatible version of LogiKal.
Open the file on Microsoft Windows with Orgadata LogiKal. If the file is associated with LogiKal, double-click it; otherwise, start LogiKal and use the application's file-opening or import function, if available.
A BK1 file may depend on other LogiKal data or on the LogiKal version that created it. If LogiKal does not recognise the file, keep its original filename and location and contact the person or organisation that supplied it.
Open the file in LogiKal and use the application's export, report or project-saving features if a different format is required.
Because BK1 is application-specific data, exporting from LogiKal may preserve only the information supported by the selected output format.
Software applications that handle other tasks involving bk1 files:
Microsoft Windows
File type category:
Graphics file
Date updated: April 25, 2019
Record marked as obsolete and not updated for a long time.
The bk1 file extension is also known to be associated with VirtuaGirl, a free program that brings up dancing girls right to your desktop.
The bk1 file represents graphic containers that were used in old version of VirtuaGirl and usually contain model animations.
The latest version does not use this format anymore and probably doesn't support it as well.
There are several old (mostly DOS) tools that can work with *.bk1 format.
We do not know about any possible conversion or this file type.
Software applications that handle other tasks involving bk1 files:
Microsoft Windows
Online conversions and file conversion information are provided by 101convert.com.
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