changing text in existing briefings?

[davea]

Has anybody figured out how to change text in the existing briefings, for example to correct a spelling error or similar?

This thread says it can't be done:

viewtopic.php?f=326&t=54435#p507756

The text is in the strings.whdat file. But modifying the strings.whdat file doesn't have any effect. This is because the binary scenario file <name>.whscn has the strings "baked in". If you edit the whscn file (BACK UP FIRST! IT'S BINARY) you can change the text, as long as you keep the string the same length. But that only works for new games; each save game file also has the strings baked in. You can change it in the save game file the same way, but only keeping the string the same length.

Is there a modding tool which allows changing the whscn file to change a string including its length?