Axapta uses quite a number of file extensions for the files that are installed as part of Axapta. Even though at first sight, people will be bewildered with these te(o)ns acronyms/extensions, it follows a very good naming convention and once it’s understood, it is very easy to follow these file names and extensions.
First Letter: owner of file:
Second Letter: contents of file:
So a file with extension .ald is
Thanks to Michael Fruergaard Pontoppidan (who came out this table) and Tao Wang (who provided this info to me)
In theory there could be 2x5x4 = 40 file extensions :)