I use both Mac and Win versions of Scrivener, and find the ‘scratch pad’ feature to be useful for keeping running & miscellaneous notes. I place a folder called “Scrivener Scratch Pad” in my DropBox folder, and link it via ‘preferences’ to both Mac and Win versions.
The problem is the auto-generation of the .rtfd format for a scratch pad file in Mac; this format is not recognized by Scrivener for Win, and will not display or open. However, if the scratch pad file is created in Win, it is an .rtf format, and Mac version will list & open it. Once an .rtf note is created, it can be edited & revised in either Win or Mac, and it will retain its .rtf format.
(I will assume that the Mac version of Scrivener will probably not revert to .rtf format, nor offer an option [please??] of either .rtf -or- .rtfd for scratch pad files?)
I find myself using AbiWord (Win) or Bean (Mac) to open/add/revise the .rtf format scratch pad files in DropBox; later, Scrivener scratch pad will auto-display these entries. It’s a very convenient way for me to keep a folder of notes universally available with or without Win or Mac Scrivener open. The only caveat is to avoid making those .rtfd format scratch pad files with Scrivener for Mac.