This is a great tip. Thanks geo.
I just made use of it on a complex 90-page project that was crashing when modifying color profile settings. For this particular file, the traditional thumbnail drag did not work so I was glad to find the tip.
I ran a before/after PDF to compare using Adobe Acrobat's compare feature and the text, images and other settings like H&Js appear to have come in correctly.
Sidenote: My new file grew compared to the original (from 51mb to 72mb.) I'll take the *bloating* without having to rebuild.