BK1 file: How can I open a .BK1 file?
The table below provides useful information about the .bk1 file extension. It answers questions such as:
- What is the .bk1 file?
- What program do I need to open a .bk1 file?
- How can the .bk1 file be opened, edited or printed?
- How can I convert .bk1 files to another format?
We hope you find this page helpful and a valuable resource.
✅ FlashGet Database Backup

The BK1 file is a FlashGet Database Backup. JCD is FlashGet's download database file. FlashGet backs up JCD file every day. The backed-up files are named default.bk1, default.bk2, and default.bk3.
✅ Windows Indexing Service Data

The BK1 file is a Windows Indexing Service Data. The Windows Indexing is a Windows service that is designed to index all of the files on your computer into a database.
✅ CA ERwin Data Modeler Backup

The BK1 file is a CA ERwin Data Modeler Backup. CA ERwin Data Modeler (ERwin) is a software tool for data modeling (data requirements analysis, database design etc) of custom developed information systems, including databases of transactional systems and data marts.
✅ Aspen HYSYS Backup File

The BK0 file is an Aspen HYSYS Backup File. Aspen HYSYS is a process modeling tool for conceptual design, optimization, business planning, asset management, and performance monitoring for oil & gas production, gas processing, petroleum refining, and air separation industries.
✅ Corel WordPerfect Document Backup

The BK! file is a Corel WordPerfect Document Backup. Corel WordPerfect is a popular, fully-featured commercial word processor program.
⚠ Be careful with .bk1 files.
It's important to know that the .bk1 file extension can be used by various programs, not just the ones you expect. This includes potentially harmful software or malware that might create .bk1 files. Be cautious when dealing with .bk1 files from unknown sources.
🚫 The .bk1 file extension is often given incorrectly!
According to the searches on our site, these misspellings were the most common in the past year:
Is it possible that the filename extension is misspelled?
We found the following similar file extensions in our database:
🔴 Can't open a .bk1 file?
When you double-click a file to open it, Windows examines the filename extension. If Windows recognizes the filename extension, it opens the file in the program that is associated with that filename extension. When Windows does not recognize a filename extension, you receive the following message:
Select an app to open this .bk1 file
It means that the operating system does not have a default app associated with the .bk1 file type. To resolve this issue and open the file, you can take the following steps:
- Right-click on the .bk1 file. A context menu will appear.
- From the context menu, select Open with. Windows will display a list of recommended apps.
- If the desired app is listed, select it from the provided options.
- If you cannot find the appropriate app, you may need to install software that supports the specific file type.
If you don't know how to change the default app for the .bk1 file, check the FAQ.
🔴 Can I change the extension of files?
Changing the filename extension of a file is not a good idea. The extension of a file serves as a hint to the operating system and various software programs about the type of data contained within the file. When you alter a file's extension, you essentially modify how software applications interpret and handle that file. Every file has a specific format, also known as its file type or file format. The problem is, changing the file extension does not change the file format.
If you have helpful information about the .bk1 file extension, write to us.