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HxD, a Hex Editor

A what?

A hex editor (or binary file editor or byte editor) is a type of computer program that allows a user to manipulate the fundamental binary (0 / 1, zero / one) data that makes up computer files. Note that computer files can be very small (just a name, with no content) to very large (content spanning multiple hard disks). A typical computer file occupies multiple areas on the platter(s) of a disk drive, whose contents are put together to form the file. For more details see the related Wikipedia article.



One of the best Hex Editors, and probably the most user friendly is XVI32. The name XVI32 is derived from XVI, the roman notation for the number 16.

Other Editors

A fairly comprehensive comparison chart can be found on Wikipedia: Comparison of Hex Editors

Common RO Related Uses

The most common uses for a hex editor are:

  • Changing DATA.INI to something else
  • Changing the client name in the window title
  • Renaming Clientinfo.xml to something else
  • Removal of /who command

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