mIRC Now-adays by default locks $encode, and $decode
If you are using those methods in your addon, then this DLL is the perfect for you.

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Zion Base 64 DLL

//echo -a $dll(zb64.dll,zencode,My String)
//echo -a $dll(zb64.dll,zdecode,My String)


functions:  zencode, zdecode, info