Create the APD directories You must create at least two directories on a host machine: one for the environment file and another for the version file. The two file types cannot be stored in the same directory. However, you can store multiple files of the appropriate type in each directory. Ensure that the MID Server has permission to read the files in these directory. For this example, create a directory called /APD at the top level of the host machine and another directory at the same level called /APD_version.