Please provide a javascript that can edit .xlsx file and do search and replace in all sheets and save it.
.xlsx files are binary files. The only way to modify them is to open them through the appropriate software. Even if you can call such program through a Javascript you won't be able to modify your file.
The Apache POI project (http://poi.apache.org/) provides a Java API that allows you to manipulate MS Office documents.
You can call Java APIs from Javascript (see "Executing Java Code" http://www.neotys.com/documents/doc/neoload/latest/en/htm...)
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