Let me guess: the mission is not PBOed but in its own directory and the directory name of the mission contains more than one dot? If so, read on:
ArmA (and probably OFP, too) uses the dots in the directory names to specify the island where the mission takes place (
missionname.island). If you have a mission like
foobar_v0.8.15.Sara ArmA will search for the island "
8" (because that's what's between the second and the third dot in the name). If you try to load this mission you will get the following error:
No entry 'bin\config.bin/CfgWorlds.8'.The solution is simple: remove the additional dots (e.g.
foobar.Sara)!
Thanks to Spooner for putting dots in his mission names and to Sysinternals for the magnificent ProcMon!