https://blogs.msdn.microsoft.com/rob/2013/11/14/debugging-vs2013-websites-using-64-bit-iis-express/
Command-Line:
For VS2013, use
reg add HKEY_CURRENT_USER\Software\Microsoft\VisualStudio\12.0\WebProjects /v Use64BitIISExpress /t REG_DWORD /d 1
For VS2015, use
reg add HKEY_CURRENT_USER\Software\Microsoft\VisualStudio\14.0\WebProjects /v Use64BitIISExpress /t REG_DWORD /d 1
原文:http://www.cnblogs.com/MaybeMars/p/6164029.html