View XBM Files Online
An .xbm file is an icon or cursor image used by the X Window System (X11). Its appearance is defined by plain text written in the C programming language. Developers can embed XBM files in C programs that use X11 as their GUI framework.
If you want to use the image an XBM file contains outside X11, you'll likely need to convert it to a more-common image format, such as JPEG (.jpg) or PNG (.png). Doing so will allow you to open the file in most common image viewers and editors.
About File Helper
File Helper is a free web-based file utility that can open X11 Bitmap Graphic files and over 150 other file formats directly in your web browser. It displays file properties, including metadata, and image EXIF data, along with information about the corresponding file type. File Helper can also view and convert images to several common formats. Have an unknown file or a file without an extension? No problem — File Helper can identify over 15,000 file types.