Is it possible to call a script in Digital Micrograph from the Windows command line? I cannot seem to find information on command line options, if any are available, for DM.
No, this is not possible for GMS version 2 or lower. There are no command-line parameters for script-launch in DigitalMicrograph.
However, if you want to run a script automatically on start-up of DM, you can do this by installing a script as plugin (.gtk file).