When you create a map, a Map file (.map) and a default Runtime Configuration File (RTC) file with the same name as the map file name is created, and the RTC file opens in the Map Editor. For example, if the map file name is test.map, then the RTC file is test.map.rtc.

A map file contains mapping details (the options you configured to extract, transform, and load). A RTC file contains connection information for the source and target connections. It also contains the settings configured on the Configuration tab such as Execution Options, Map Events, Global Variables, and Script Libraries.

You can save additional RTC files for a JSON map to perform additional development or testing without changing the existing map or the RTC file. If you are developing in a development or test environment and eventually want to move the map to a production environment, then you can use one RTC file for the development environment and the other RTC file for the production environment (similar concept as macros).

To create another RTC file for the same map:

If you click on the .map file to open it in the editor (example, Test.map), this opens the default RTC file (Test.map.rtc). If you want to open the map using a different RTC file other than the default, double-click on the required RTC file.