java.io.IOException: Cannot run program "START /D C:\Users\Wiz\AppData\Local\Arduino15\packages\WizIO\tools\bc66_tools\1.0 /W FlashTool.exe" CreateProcess error=2, The system cannot find the file specified
The link to EXE is OK
FlashTool.exe should be started from a specified directory and I use windows command "start /D folder... /W application"
I'm not sure about your quote placement. Usually, we quote paths in order to handle folders that have spaces in them. The Arduino IDE seems to try to do some automated handling of this, which causes more problems than it fixes in my experience.
"quote placement"
I think ... java CreateProcess run APP as first argument and other arguments
Process p = new ProcessBuilder("application", "arguments").start();