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Editorial Team
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Asked: 2026-05-15T13:17:24+00:00

I have an application which has many services and one UI module. All these

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I have an application which has many services and one UI module. All these are developed in VC++ 6.0. The total KLOC would be 560 KLOC.

It uses Mutltithreading,MFC and all datatypes like word,int, long.

Now we need to support 64bit OS. What would be the changes we would need to make to the product.

By support i mean both like running the application on a 64bit OS and also making use of the 64bit memory.

Edit: I am ruling out migration to VS2005 or anything higher than VC6.0 due to time constraints.

So what changes need to be done.

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1 Answer

  1. Editorial Team

    64bit Windows includes 32bit via WOW. Any 32bit application should just continue to work.

    (It is only drivers that have to match the bitness of the OS.)

    [Note to commenters: plugins—of whatever type—are not separate applications but dlls used by other applications which do need to match the host. In that case you also get the same problem where 64bit extensions are incompatible with 32bit hosts.]

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