We must make backup of your registry keys where you intend to make changes. That helps to restore the situation, if we had gone wrong. Backup is termed as Export in Registry Editor.
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How to do:
Opening registry Editor:
From the Start menu, select Run. Type regedit and hit enter.
If you have no Run in Start menu (How to have Run?), you can manually start from this location:
c:\windows\system32\regedt32.exe where C is your windows drive.
Sometimes, Registry Editor may be prohibitted by Administrator.(How to Enable?)
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Exporting Registry:
Exporting Registry as a whole is not a good idea. Because, some of the registry keys may be in use, so will not be able to import while working.
Export only that keys, in which we are making changes.That is, in the below picture, if we are changing the value of "Version"(seen in right pane), then export the key "devenum" as below. Name it as you could remember what it is (such as devenum_restore.reg ).
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Importing Registry:
Double click on the reg file you exported, take it as devenum_restore.reg for an ease.
Click Yes and then OK to add that value to Registry.We can edit that file itself by Right Click>Edit.
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