I know you’ve probably had a long relationship. You have had your share of troubles, and joys. I am pretty sure it has been an emotional ride – and its difficult to let go. However, it is time.
FRx is not supported on 64 bit, and as far as I know it will not be supported in GP 2013. There are viable alternatives out – Management Reporter from Microsoft has a new version, MR 2012 is looking good, and there is a nice migration path to upgrade your FRx reports.
Check out this post by David Musgrave which is a nice summary of resources The Management Reporter 2012 Lowdown - Developing for Dynamics GP
Another very nice alternative pointed out by my friend Michael Zurzolo is BI 360, which is an excellent excel based Financial Reporting tool - http://www.solverusa.com/products/frx
So please, start planning to move away from FRx.