what is the best software to create (.xll) add-ins

anyone has experience with any good compiler .  I need to protect some vba code and create xll add-in.

can you recommend some software?
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FloraAsked:
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Glenn RayExcel VBA DeveloperCommented:
This question has come up before.  I think you could create a COM add-in with Visual Basic 6, but it won't work with 64-bit Office.

See this thread:
http://www.experts-exchange.com/Software/Office_Productivity/Office_Suites/MS_Office/Excel/Q_28530282.html

-Glenn
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FloraAuthor Commented:
thanks Glenn.    I want the add-in not to have any limitations.  

while I was goggling I found this free Excel DNA  http://excel-dna.net/   do you have any knowledge about this?
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