[Q] How do you handle verthash.dat?

Hi,

I just upgraded the Nanominer to v3.3.12 in RainbowMiner - since it's got Verthash support from this version on, I have got some questions. How does the miner handle the verthash.dat:
- Does it initially create the file?
- If yes, in which folder?
- Is there a parameter to specify the path to an already existing verthash.dat?