The file extension XBM identifies bitmap images in the format of the X-Windows system. This format is based on American Standard Code for Information Interchange (ASCII) text and is mainly used for icons and cursors. It only supports grayscale.
The source files can theoretically be opened and edited in any text editor. They are compiled by a C compiler into XBM files. As extension also bm is used.
X-Windows is a GUI (Graphical User Interface) system to set up graphical user interfaces for Unix and Linux systems.
Most often resolving problems with opening XBM files is very simple. Just install an appropriate program that supports such files. All of the listed programs support XBM files, but may vary in offered function and purpose. Some programs may be capable only of viewing contents of XBM files or offer file conversion options, but may not be capable of editing such files.
It is possible that although a compatible program has been installed on user’s system, it is not used by the system to open it. This may happen because no default application was associated with this type of files. To associate XBM files with given application, select "Open with" from drop-down menu (accessed by right-clicking on the file). Then select from the list the program or application you want to be used to open this type of file. If the XnView applications is not on the list, select "Browse" option in order to manually locate the directory where XnView has been installed.
Sometimes problems with opening XBM files may not lie with the application itself, but can arise due to other causes, such as: