If you're using the reference client Bitcoin Core, you can just copy the wallet.dat file from the Windows machine to the Mac machine.
Other clients, you may be able to import private keys.
Which client are you using?
Topic: Program that converts a windows wallet to a mac one? (Read 622 times)
Which wallet client? If it's for some small alt coin that only provides a Windows binary then the program you need is a compiler.
legendary
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Core dev leaves me neg feedback #abuse #political
just send the funds from one wallet to the other wallet
Not really 
Simply use Mac client provided.
Simply use Mac client provided. 
Is there such thing?
AFAIK there shouldn't be a difference as long as you are using the same client for both. What client are you using?
Is there such thing?
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