[release32 apr 13] When trying to open an (apparently legit) form from
an XML layer, an error dialog (no stack trace, just simple
notification) pops up saying that the form file format was not
recognized (no details). Click OK, but it immediately pops up again;
modal, so the only way to cancel is to shut down IDE (by closing main
window).

I don't think editing forms inside a layer (use dev version of apisupport) is a
particularly important thing to support in general :-), but anyway if there is
some bug in the layer filesystem impl, the form module is doing a bad job of
helping me debug it; the error should contain some kind of useful information
pointing at what is wrong; and certainly it should not continue to open the
dialog every time it is closed.