Will a 64 bit application support MSXML 3.0?

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We are planning to convert the 32bit application to support 64 bit OS. Currently the application uses MSXML 3.0 in Javascripts. I want to know whether it will work as it is in a 64 bit os or will there be any issues.

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Based on a look at the COM registration on 64bit Win7 it appears that there is a 64bit MSXML3.

However use of older versions of MSXML is deprecated, better to upgrade to the latest—V6—a significant application change is a good opportunity for this.