Files ending in CFM are source code files in the ColdFusion Markup Language. ColdFusion ML is a scripting language developed by Allaire (now part of Adobe) for server-side Internet applications. Typically, CFM files are web pages with Coldfusion script code running on a Coldfusion server. The html code is added to the file by the server so that it can be displayed to the user in a web browser.
Coldfusion offers the developer a variety of functions and tags such as database queries, image manipulation and mathematical operation as well as formatting options. Coldfusion Server is few because of Adobe's proprietary license. With Railo there is also an open source server, which does not support all features and tags of Coldfusion.
CFM files are just text files that can be processed by a ColdFusion server. They can be opened and edited in any text editor, however it is recommended to use editors with developer functions such as syntax highlighting for easier work.
Most often resolving problems with opening CFM files is very simple. Just install an appropriate program that supports such files. All of the listed programs support CFM files, but may vary in offered function and purpose. Some programs may be capable only of viewing contents of CFM 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 CFM 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 Adobe ColdFusion applications is not on the list, select "Browse" option in order to manually locate the directory where Adobe ColdFusion has been installed.
Sometimes problems with opening CFM files may not lie with the application itself, but can arise due to other causes, such as: