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Add file to X: volume in WinPE

I have an existing WinPE USB flash disk. When I boot from the disk I have a command prompt at this location:

X:WindowsSystem32

I want to add a text file to this location. This is to make it easier to find for others who will use this USB key.

There are other tools already on this WinPE disk; I don’t want to start over and recreate it.

How can I do this?