Your syntax is wrong, because it doesn't take the space into account. Your command (axutil export /model:usr model) is interpreted as an import of usr model with an additional parameter called model (which can't be recognized). You have to use correct DOS syntax for strings with spaces, therefore your command should be axutil export /model:"usr model". The solution for "This assembly id built by a runtime newer than the currently loaded runtime" is explained on Technet in Troubleshooting working with model files .
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