It looks like there are a few libraries, at least one, QPFloat, with a windows version.

Sorry. Did you see one that specifically stated that MSVC was supported? (I'm looking again, but not seeing it?)

punching a few of those keywords throws up some code (idontgetit) http://stackoverflow.com/questions/2963055/msvc-win32-convert-extended-precision-float-80-bit-to-double-64-bit

I thought about trying to use the 80-bit precision that available in the x87 FPU, but to get access to it I'd have to drop into assembler; and with MSVCx64, that means using MASM64 as the 64-bit compiler doesn't support inline asm.

But Masm64 (the version I have) is borked. It doesn't support a crap load of stuff you want it to; it's macro facilities have a habit of producing unassemblable code; and there is no support available at all. There are only about 10 pages of information about writing Masm64 code on the entire 'net; and half of those are just stolen copies of the other half.

Pretty much a dead end.

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