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I am OK with this solution. MLCad 3.4 does no longer remove blank lines.

Thanks for mention that.
I just tried version 3.4 of MLCad and it saves also blank lines. So that should not be a problem .
I go ahead and try to change DATHeader now.

In fact DATHeader deleted empty lines in there has been an error with comments detected and you correted them.
While I am currently at this, I think DATHeader should now also "empty" lines that only consists of "0 //".
So the number of lines should not be affected during this operation.

Edit:
While I am just on the code I also limit the part description to Integer.MaxValue according the call for votes on this issue.