Regshot is an open-source (LGPL) registry compare utility that allows you to quickly take a snapshot of your registry and then compare it with a second one - done after doing system changes or installing a new software product.
V1.9.0 - 2013-02-02 New to 1.9.0: x64 and Unicode versions. You can compare shots saved with different "UseLongRegHead" option. Loading ANSI hive files in Unicode builds and vice versa is not supported.
New to 1.8: File shots are now saved in hive file. "UseLongRegHead" option added in regshot.ini to compatible with undoReg (1.46) "UseLongRegHead=1" means using "HKEY_LOCAL_MACHINE" instead of "HKLM", default 0 Do not compare shots saved with different "UseLongRegHead" option! (limit gone in 1.9.0)
New to 1.7: regshot.dat now changed to regshot.ini, skip dirs and skip registry keys are included. The executable's size is smaller!