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search and replace in all files
search and replace in all files

How do I replace text in all files in a folder? How do you replace a word in all files in Windows?

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Multiple File Search and Replace
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search and replace in all files
How do I replace text in all files in a folder?

GrepWin would do this among others, and it is a Explorer plugin. However there is quite a big array of different applications available that can do this.