You will need the entire BPAV folder to work with the XD Cam Transfer program. You should never need to go beyond the BPAV folder for any reason, leave these other folders and files inside it alone. When you make quicktime .mov using the XD Cam Transfer program you direct it to the parent folder containing the BPAV folder, then all of the files can be previewed. SMI clips are spanned clips that are larger than 4 gigs.
Create a parent folder for each BPAV folder. Upload. Client can then use free Sony Clip Browser to view after downloading.
BPAV is always the safest for giving to client.
You can rewrap to MXF but the the client must be able to handle the MXF
You can rewrap to MOV but the client must be able to handle EX codec in MOV (requires FCP 6.0.2 and up or CalibratedQ).
Do spend time learning workflow or you're going to back yourself or your client into a bad situation.
You can not use ClipBrowser to rewrap to MOV for example. You must use XDCAM Transfer for that.