if you're fine with command line, then 
dumpbin /exports perl513.dll

[download]
could provide you with needed information with a quite simple text output that should be enough for you 
....
         37   24 002126B4 PL_collation_ix
         38   25 00213AC8 PL_collation_name
         39   26 002100E4 PL_collation_standard
         40   27 00213A64 PL_collxfrm_base
         41   28 002100E0 PL_collxfrm_mult
         42   29 00213440 PL_colors
         43   2A 00213544 PL_colorset
....

[download]

I've browsed C API and haven't found a function that lists functions from a DLL
I seem to remember that one could get a function by ordinal number (@3) but these must be false memories implanted by someone.

Win32::API is closest that I could advice, and this also suggests you know name of your function.

In reply to Re: On Yaks and the Shaving Thereof - finding exported symbols of a C library by vkon
in thread On Yaks and the Shaving Thereof - finding exported symbols of a C library by Corion

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