No. Some way or another, the files must be converted to readable text before being indexed by Splunk. If there is a simple command line utility to do this, it's possible like this might have been written for (e.g.) Solaris BSM logs or AIX logs.
Note that named pipes/fifos are not supported or documented in the current version (4.2.x) of Splunk.
I strongly recommend you file an Enhancement Request with Splunk to allow binary log files to be monitored and passed through a pre-processing filter by Splunk. This is actually rather difficult to do correctly, but is a very common use case.
