 bug: Arduino IDE 'Export compiled Binary' doesn't work (2.0.0-alpha1 only)

'Export compiled Binary' should place a .bin file into my project folder.

This works as expected using 1.0.6, however does not work with alpha1. Both compile fine without error.

```
Arduino IDE + alpha1
Windows 10
```

In the meantime, I can still locate the .bin file here:
`C:\Users\X\AppData\Local\Temp\arduino_build_XXXX\`