There is only one file type that uses the .XPP extension:
X++ Source Code File
Source code file written in X++, an object-oriented language developed by Microsoft for Microsoft Dynamic AX ERP (enterprise resource planning) software; uses syntax similar to the C# language; can be created and edited using MorphX, an IDE that is part of Microsoft Dynamics AX.
X++ can be used for creating various types of ERP business programs, such as reports and logic that read and write Dynamics AX database information using the SQL syntax supported within X++.
|Microsoft Dynamics AX||Commercial|
Updated: March 9, 2012