Acquisition protocols
| qpx_AcqTWAINProtocol | 1 | TWAIN identifier |
| qpx_AcqPictureTransferProtocol | 2 | Picture Transfer Protocol identifier |
| qpx_AcqVideoProtocol | 4 | Video acquisition protocol identifier |
| qpx_AcqICScannerProtocol | 8 | Mac OS Image Capture Scanner protocol identifier |