If comodo is still not allowing you to open the game, there are a couple things you can try. First of all, set the Behavior Blocker on comodo to limited. This helps for a lot of games, not just FH.
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Secondly, if that doesn't seem to work, follow these steps to move FH into comodo's trusted files.
Go into CIS advanced settings, then to Security and then File Rating. First look in Unrecognized files and if the file in question is listed there, click the up arrow at the bottom, select the file and then choose Move To--Trusted Files.
If the file is not listed as unrecognized, then go to Trusted Files, again click the up arrow and choose Add. Browse to the file and add it to Trusted.