onLoad功能区回调从Excel VBA .xlam失败（不启动/工作）

I've created a simple Excel add-in to demonstrate the problem whereby the ribbon onLoad event isn't firing when the project is saved and automatically loaded as a .xlam but does work when opened as a .xlsm. I've checked it for Excel 2007 (with the corresponding xmlns), 2010 (x32) and 2013 (x32) and it fails in all cases when loaded as a .xlamI've created a simple Excel add-in to demonstra