How to mount multiple Windows remote directories and change a file on each?

I need to mount about 30 windows directories. I have a file that I need to change in c:userstestfile.txt. the file currently contains text and I need to overwrite it with another file (it is a configuration file for a program)

I have administrator useame and password for each of these computers.

I really want to avoid going around to each computer and changing this manually but I am not sure how to. If there is a way I can mount these directories one by one and automatically overwrite the file, close the coection, and start the coection to the next computer that would be great. If there is a script you can suggest or a way of doing this I would really appreciate the input. thank you.