The WLAN firmware along with other resources are located in the resources folder. They are converted in a structure at run time. The main reason to do this, is that some customers opt to put some resources in memory while others can put in external serial flash as part of their file system.
your final structure will be in the build folder (i.e. build/appxxxx/resources/43362A2_bin.c
The definition of the resrouce structure itself (resource_hnd_t) is in wiced_resource.h