How can I edit the list of connections listed in Explorer when I map a connection?

Start the registry editor (regedit.exe)

Move to HKEY_CURRENT_USERSoftwareMicrosoftWindows NTCurrentVersionNetworkPersistent Connections

In the right hand pane you will see a list of values a-z and each value will have a value like "\"

To remove a map, select the letter associated with it and click DEL

You should now edit the Order value and remove the letter you have just deleted.

If you wish to add a mapping select New - String Value and enter a name of a-z (use one that is not in use) and press enter. Double click on your new value and set to the share name, e.g. "\johnmachined$"

Edit the Order value and add your new letter to the end of the string.

Close the registry editor

Start Explorer and your new share or removed share will have taken effect.