alt-boot-disk-util always fails with device open failed!

C:\altera\15.1\embedded\env.sh also fails to find my qsys directory since I am using the Lite version which defaults to C:\altera_lite\15.1\quartus\sopc_builder\bin. By defining the environment variable QUARTUS_ROOTDIR_OVERRIDE to be the correct path for the Lite version, I was finally able to get the sopc-create-header-files script to run correctly. To the tutorial's credit, 15.1 was not listed as one of the supported versions, but I think the maintainers of the env.sh script should figure out how to handle that right. Also noticed the Windows PATH variable does not get properly imported into cygwin. I have a lot of spaces in the PATH variable, but that didn't seem to cause enough problems for me to worry about it at this point.