Depends on what information you want to find ... you can add a link to the DLL in the project in Xamarin Studio, and then expand the Links folder and double-click on the DLL ... this will open it in AssemblyBrowser and display AssemblyInfo, which was compiled into a dll.

If you want to know what architecture the DLL was built for, run it in a terminal window:
file insert_filename_here.dll
If it is an x86 (or "Any processor") DLL, it will say:
insert_filename_here.dll: PE32 executable for MS Windows (DLL) (console) Intel 80386 32-bit Mono/.Net assembly
If it is an x64 dll, it will say:
insert_filename_here.dll: PE32+ executable for MS Windows (DLL) (console) Mono/.Net assembly!
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