Embedding files / binary data at the document level

I see that there are APIs in Document for getting embedded files, for example:

GetEmbedFilesCount()
GetEmbedFileName()
GetEmbedFileDesc()
GetEmbedFileData()

However, I don't see any corresponding APIs to be able to write embedded files to a Document. Is this possible?

Thanks!

dear user:
remove and create embed files only available on Master edition.