Opening rtf in Goodreader

I have two rtf files synced to my iPad, which are perfectly readable in DTTG - I see a file, clicking opens the rtf text.
Opening them in Goodreader creates a zip file, unpacking the zip file creates a folder with 10+ subfolders in which de rtf file is hidden. The folder structure is an exact copy of the folder structure of my hard disk.
Is this normal?