Do I as the Developer have access to user data?

Synergy

Does the Windows version have the ability for me to access the user's data (with their permission) to check their progress?

Braydon_SFX

Not built in, but this is something you can accomplish using a third party site like Appformative.com which is run by @Hopscotch .

Hopscotch

Thank you for the mention @Braydon_SFX

@Synergy, looking through the different requests you have posted, it does look like you need to use a back-end service of some kind.

You can host, manage and develop the back-end yourself, or you can call on us at APPFormative. Over and above the standard features, we do cater for custom solutions.

Synergy

Thx @Braydon_SFX and @Hopscotch . I was already in the process of contacting Appformative. This is a confirmation.