Mine

fileHandle = rapi_session.createFile("\\Opslagkaart\\"+filename, GENERIC_READ , 0, OPEN_EXISTING , FILE_ATTRIBUTE_NORMAL )



fileObject = open(filename,"wb")
if fileHandle != 0xffffffff:
    print "Reading file"

#	rapi_session.readFile(fileHandle, None, 10000)
#	rapi_session.readFile(fileHandle, None, 700)
#	rapi_session.readFile(fileHandle, None, 80)
	#rapi_session.readFile(fileHandle, myString, 40)
	#rapi_session.readFile(fileHandle, myString, 64000)
    while True:
        _dataBlock,_dataBlockLength = rapi_session.readFile(fileHandle, 65535)
        if _dataBlockLength > 0:
            fileObject.write(_dataBlock )
        else:
            break 
#print _dataBlock

    print "Closing filehandle again..."