Import .REG File
Imports REG file on to the user's machine.
Optionally, you may add comments here describing the purpose of this element.
Specify the full path to file of the registry .reg. You can create it with the regedit.exe application.
Import .REG File command
Use 64-bit regedit.exe
Import of .REG files occurs with the help of the program regedit.exe. By default the 32-bit version of regedit.exe is launched. If you want to import a .REG file for use in 64-bit applications, check that checkbox.
Checked => All variables , such as #varname# are replaced with values before importing registry keys.