Sentence:  If the provider of these DLLs has not updated the code to a 32-bit environment, you will have to switch to a new 32-bit library or write <WSD>thunks</WSD> between your 32-bit code and the 16-bit DLL. 
Meaning of the word marked with <WSD> tags:  A mapping of machine data from one system-specific form to another, usually for compatibility reasons, such as from 16-bit addresses to 32-bit to allow a 16-bit program to run on a 32-bit operating system.