On Posix systems it takes 2 commands:  "grep -b ..."  followed by "truncate"

 

Both of these commands are available natively on MacOS and Linux.  And can be installed from any of a dozen packages for Windows.  The functionality can also be created in Perl, Ruby, Rexx, and others.  Again, all of these are available for all platforms.

 

I wrote the exe, simply because those not interested/capable of using a Hexeditor would want something simple, small, and easy.

 

Kendall