Wayne Berke has written a freeware Windows NT registry tool, regutil, which has features:

dumps any subtree of the registry to a file in human-readable, text format
supports all important value types including binary and multi-string
loads keys and values from a dump text file to any branch of a local or remote registry
merges keys and values from a dump text file into an existing subtree of a local or remote registry
removes an entire registry subtree in a local or remote registry
clones a local registry subtree to the same path in a remote registry (similar to rdist -r for registry keys and values)
load, merge, remove, and clone operations allow you to specify either a single target PC or a file with a list of PCs, all of which will be updated