Photoshop could not open a scratch file disk on Mac

Here is the Link:

Change Photoshop Scratch Disk

How to Flip a Path in Photoshop CS4/CS5

The Essential thing Need to do is:
Making a New Layer

Because if you Work on the Background Layer
you haven't the possibility to Flip you Path

After that you can proceed to Flip your path with:

Selecting the Paths Window

Selecting your Path

Flipping your Path

How-to Save Image as ICO on Photoshop CS for Mac and Windows:

How-to Save As ICO on Photoshop

Find on the Linked Article the Guide for Saving Image As ICO on Photoshop CS.