Hi, thanks for sharing this.
You have my assurance that NCrunch does not contain a virus. This is a false positive.
If you like, you can check the results of online services that are able to push the file through a range of different scanners. Virus Total has quite a good one that allows you to scan a file without downloading it.
As a vendor, there is unfortunately very little I can do about false positives. It isn't possible to design a product around virus scanner detection systems, and because NCrunch does a range of things that a scanner would consider suspect (starting processes, manipulating DLLs and PDBs), there will always be a high occurrence of false positives when scanning it.
The NCrunch.AppContainer.exe process is only used by NCrunch when running tests over legacy Windows Store applications. Assuming you're not developing in such a scenario, NCrunch should work fine without this file.