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I'm looking for a way to be notified if a text file changes (Windows 7), and be offered a file diff upon such a change. For example, the text editor Notepad++ does part of this, notifying me of an external change (in a file currently open) and giving me the option of reloading it from disk or keep what's currently open:

Notepad ++

But I want to see the changes made in the new version, if any, so this isn't enough. Is there a relatively easy way to get this, perhaps a plugin for Notepad++ or another text editor with this feature? (Actually, I remember that the text editor SlickEdit had/has this feature, but perhaps there's another solution)

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You can youse for this compare plugin.

Quite easy tutorial is at

There is just one problem, you cannot open in Notepad++ one file multiple times. So you must click on Nein (No) in dialog window. Then copy old version to diffent file or window and reopen the file again. Then you can compare them.

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