Between 1998 and 2005, many small utilities used 6-digit registration codes like 100412 . The prefix frex16 could be:
: If you've purchased the software, check your purchase confirmation email or any documentation provided with your purchase. Sometimes, the registration code is included in these materials. frex16 100412 registration code
The code often appears in technical contexts as an error or status identifier rather than a unique user registration key: Between 1998 and 2005, many small utilities used