I quickly responded to this privately yesterday by email, but wanted to make my answer available to others here as well (and credit to Paul for correcting me about this a few months ago).
I am not a regular Windows user so I forgot about the hidden folder where the quad files are stored in Windows 7+. Then I remembered a post Paul Roark made about this here:
https://groups.yahoo.com/neo/groups/QuadtoneRIP/conversations/messages/12922
Basically, it says that there is a different set of folders for users application data (for security reasons?)
From Paul's post: "The file path is Win 7 uses a hidden folder. See C:\Users\[your user name]\AppData\Local\VirtualStore\Program Files (x86)\QuadToneRIP\QuadTone "
If I were a regular Windows user I would make a shortcut to that folder someplace that is easier to get to...
Hope that helps,
Richard Boutwell