Pulling documents into ODK briefcase

Hi There

I am hoping that someone can help me.

I'm trying to pull some documents from ODK collect into ODK briefcase using the Android file transfer. When I try to copy the ODK collect documents from the android file transfer (ODK file) onto my hard drive so that I can pull it into ODK Briefcase, some of the questionnaire files won't transfer across to my hard drive.

Any help would be greatly appreciated!