Import

To import a key to a *.REG file by means of ARM select the key, then from the File menu choose Import from  REG File, choose the filename, and import it into the ARM internal format.
The file being imported may be either in the new or in the old format. You will get one more main node containing the REG file data - data from one of the keys.
Now you can compare the imported key to respective keys from earlier copies, as well as to the current Registry