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The first "safe .WFM" rule involves the line that says:

** END HEADER -- do not remove this line

Don’t remove or modify it! If you do, you might lose the contents of the header or prevent the Form designer from being able to read the form from the .WFM file.

The next rule is about the standard bootstrap code: don’t bother changing it. Every time the .WFM file is written the same standard bootstrap is rewritten anew, so any changes you make will be lost.

If you want to change the way the form is instantiated and opened when you run the form, instead of changing the bootstrap code, you need to add to it or replace it by placing your own bootstrap code in the header.

The key is to realize that a .WFM file is just a program file with a different extension. When you run the form, the code at the top is run just like when you run a program. To put it another way, there is nothing magical about the standard bootstrap code—it just happens to be the first code that is found at the top of a plain .WFM file. If there are some comments in the header they have no effect.

You can place any code you want in the header. The Form designer will ignore it.