Map design content is no longer stored or saved in .dlm files in the file system. Instead, it is stored in the repository in XML format, and is no longer accessible from the file system. To view, modify, or compile a map from a release prior to 4.2.0, you must convert the map to the new XML format.
Map Designer provides a conversion utility for 4.0 and 4.1.x maps that facilitates conversion of individual or sets of maps. When you attempt to open a map created from a previous version, Map Designer prompts you to convert the map to the new format.
Click Yes to automatically convert the old map to the new format so it is readable in Map Designer.
Recommendation: When the conversion completes, it is good practice to visually inspect the new map for correctness.
To save the converted map, you must explicitly save it with one of the options of the Save submenu in the File menu. Otherwise, the map remains in the old format and is not readable by Map Designer.
Map Designer only supports converting 4.0 and 4.1.x maps that are in .cwm format. For .dlm map format, you must use the repos_copy utility to import the map definition into InterChange Server. If you want to modify or view the content of such maps, you must convert them by importing these maps into a project with System Manager.