This weblog will help you understand the "Tools" menu in the data-flow editor which will allow you to export/import your graphical message maps as MappingTool Export files (.mte). This .mte file is an accurate representation of the graphical message map and it is also editable. But i don't recommend editing it unless you are extremely conversant and sure about what you are doing with the .mte files. Place your mouse cursor on the Data Flow Editor area and press Ctrl+Shift and right-click the mouse button to view the "Tools" menu. You can keep the map in Edit or display mode to export it as a .mte file (mapping tool export file).
You will be prompted to enter the name for the .mte file. I recommend you to use the same name as your message/graphical map name. 
When importing the .mte files make sure you have your graphical map in edit mode and your source & target messages are selected. The "Import" menu item will be enabled only during edit mode.
The following screenshots show how the mapping tool export files looks like: 
Besides the transformation information, other information like User-defined functions, test cases, position co-ordinates of the graphical bricks etc are stored in this .mte files.
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