When you run eseutil /d against a database to defragment it, the streaming file associated with the database is automatically defragmented. This is the default behavior.

For example, if you run the following command at a command prompt the Priv1.edb and Priv1.stm files are defragmented. If you do not want the streaming file to be defragmented, include the /i option.

Eseutil in Defragment mode (eseutil /d) has a /s option that allows you to specify the name and location of the streaming file associated with the database. By default, Eseutil looks for the streaming file in the same location as the database and assumes that it has the same name as the database except for a streaming file extension (.stm). However, if your database and streaming file are not in the same location or are not named the same, then the /s option allows you to specify an alternate location or name for the streaming file. The /s option (or its omission) does not control whether or not the streaming file is defragmented.