How do you extract a PC .dms file image

[doctorq]

Are you sure the DMS file needs to be unpacked to a PC disk, and not to an Amiga floppy instead? I have never heard of a PC DMS file.

Where have you found the install disk, and which board is it exactly?

[doctorq]

I'm pretty sure you need to extract the disk to an Amiga floppy disk instead. You have CrossDOS up and running, so I would do the following:

First mount PC0: so you can access the DMS file, and then copy the DMS file to RAM: disk (or harddrive if you prefer this instead). Then extract the DMS file to Amiga floppy using this line

DMS write (filename.dms)

This should do the trick, and hopefully you will have the setup disk you need.

You can see some specs of your bridgeboard a long with additional software here. I hope it helps.