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Windows thinks 64bit SQLite3.dll is 32 bit
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There is no setting of the "bitness" in the build process for Windows-targeted images except for the usual PE header that results (without any explicit instigation) from specifying the target machine/architecture to the compiler.

It would be completely superfluous or dead wrong to replace any part of the PE header with something that did not match the target for which all the contained code was compiled.

As other posters have suggested, your problem solution lies elsewhere.