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  Behavior of 1.0/1.1 managed apps on 64bit machines
Time: 04:43 EST/09:43 GMT | News Source: Microsoft | Posted By: Jonathan Tigner

As I alluded to in my previous post there are multiple ways that we can go in terms of supporting legacy 1.0/1.1 assemblies on a Win64 machine. The context of the 1.0/1.1 support story is made somewhat simpler by the current plan of having both a v2.0 32bit CLR and a v2.0 64bit CLR on the box but no 1.0/1.1 CLR bits.

I mentioned that the 1.0/1.1 compilers didn't know anything about “bitness”. Basically they spit out a PE image that said “Hey! I'm managed! Run me with the CLR!” (gross simplification), whereas the v2.0 compilers produce images that range from “Hey! I'm managed, and I can run everywhere!!” to “Hey! I'm managed and I only run on x86!” etc...

This brings us to the fundamental question of this post -- what to do with 1.0/1.1 assemblies?

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#826 By 4240821 (94.177.13.246) at 3/7/2026 5:44:07 PM
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