XFO files are XSL-FO (Extensible Stylesheet Language - Formatting Objects) formatted documents. XSL-FO is a page description language that can be used to specify the arrangement of lines, images and text as well as other graphic elements on a page.
XFO files specify how XML data is formatted, for example, for the screen or print output. XSL-FO is mainly used for the generation of pdf or PostScript files.
XFO files are simple text files that are readable with any text editor. However, to see the actual document (not the XML code), you need software that can handle XFO files, so you can evaluate the instructions and formatting.
In addition to XFO, there is the much more common extension fo for XSL-FO files.
Most often resolving problems with opening XFO files is very simple. Just install an appropriate program that supports such files. All of the listed programs support XFO files, but may vary in offered function and purpose. Some programs may be capable only of viewing contents of XFO 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 XFO 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 DIGIFORMS Document Designer applications is not on the list, select "Browse" option in order to manually locate the directory where DIGIFORMS Document Designer has been installed.
Sometimes problems with opening XFO files may not lie with the application itself, but can arise due to other causes, such as: