1CBU1 file: How can I open a .1CBU1 file?
The table below provides useful information about the .1cbu1 file extension. It answers questions such as:
- What is the .1cbu1 file?
- What program do I need to open a .1cbu1 file?
- How can the .1cbu1 file be opened, edited or printed?
- How can I convert .1cbu1 files to another format?
We hope you find this page helpful and a valuable resource.
✅ Princess Ransomware Encrypted Data

The 1CBU1 file is a Princess Ransomware Encrypted Data. Princess Ransomware is a malware that locks your computer or encrypts your files.
⚠ Be careful with .1cbu1 files.
It's important to know that the .1cbu1 file extension can be used by various programs, not just the ones you expect. This includes potentially harmful software or malware that might create .1cbu1 files. Be cautious when dealing with .1cbu1 files from unknown sources.
🔴 Can't open a .1cbu1 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 .1cbu1 file
It means that the operating system does not have a default app associated with the .1cbu1 file type. To resolve this issue and open the file, you can take the following steps:
- Right-click on the .1cbu1 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 .1cbu1 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 .1cbu1 file extension, write to us.