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Type REGEDIT in start menu search box or run and press Enter.
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Navigate to the following registry key:
HKEY\CLASSES\ROOT\txtfile\shell
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Right-Click on shell and select New -> Key. Name it Copy Contents
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Right-Click on Copy Contents and select New -> Key. Name it Command
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In the right-side pane, double-click on (Default).
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In the Value Data box, type CMD /C CLIP < "%1"
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Click OK.
Now you will get the option to copy the contents of a text file from the context menu.