alphabetical list of extensions

File extension .B1

File description

B1 is a freeware compression utility which also allows the user to encrypt the contents of compressed file. The file format used by this application is B1.

The compression is done according to LZMA standard. The B1 archive is created by forming stream of binary records and then building volumes of such records. The encryption algorithm used in this format is 256 bit AES encryption algorithm which is password protected. One single archive file can be split into number of volumes and their integrity is checked using Adler-32 algorithm. The B1 archive format is based on JAVA library and this library is used for creation of archive.

Description of the problem
If you have on your computer a .B1 file that you cannot open, you are in exactly the same situation as thousands of other people who have similar problems with this or any other unknown file.

There may be several reasons why you cannot open the file with .B1 extension. Directly on this website you can find a solution of the most common problem with the .B1 file – that you do not have on your computer the appropriate program to open the file.
From the list below, select the appropriate program, install it and double click on the icon of a file that did not want to open - the problem with the .B1 file extension should be solved. However, if this does not happen, go back to the website to learn about other possible causes of the error, which have been described at the bottom of the website.
Compressed Files
Catalina Group
Last updated
July 21, 2014
File name: B1 Compressed Archive
Programs that will open this file:
B1 Free Archiver B1 Free Archiver
Mac OS
Mac OS
B1 Free Archiver B1 Free Archiver
B1 Free Archiver B1 Free Archiver
B1 Free Archiver B1 Free Archiver
The .B1 file extension can correspond to several not related file formats. If there is more than one file format with the .B1 extension, you will probably find most of them at this website. Remember that you need to download a program to support a particular file type. So first look through the entire contents of the website to select a program to support just the file you have.

Other possible reasons why your .B1 file does not want to open

In addition to the problem described above, i.e. the lack of the appropriate application to support the .B1 file, there may be several reasons that cause problems with opening and operation of the data format:

1. Incorrect version of the installed application

A quite common problem is the lack of application in the appropriate version. Even if you have an application, with the help of which you should open the .B1 file, you may have a problem with it because of its version. Perhaps in previous versions the application has not yet supported the .B1 file, so download the update and check again.

2. Incorrect .B1 file association with the program

If you have already installed the appropriate application, and it is the correct version, the file may not open correctly, because the operating system does not have information that this program supports the file. So you need to "show" which program the computer should use. To do this:

  • Right-click the .B1 file
  • Go to the "Open with" - then "Choose default program ..."
  • Locate the appropriate application
  • Click "OK"

3. The file is corrupt

It also happens that the file you want to open is corrupt and therefore there is no such possibility. In this situation, you should find its different version, or ask a person from whom you got, to send it again.