Yes, 2DTG offers Demo application for WinCe 5.0 with Data Matrix decoding library (Standard Edition, Version 11.04). The size of the image in this demo library is limited to 1280 pixels.
Please note that this library is the "Demo integration" version only. Some features of the fully operational decoder are disabled. Fully operational Datamatrix decoder for performance testing can be downloaded from the Data Matrix product page. Example of operational DPM Data Matrix decoder for Windows CE 5.0 can be downloaded from the "DPM Reader - Dolphin Handheld" page.