How can I access my Android Internal Storage (data/data) from the pc?
Directly accessing /data/data/* is not possible without root – neither on device, nor remotely from your PC.

But your question rather is a XY problem: what you really want to do is "to back up a few save game files to a pc folder so I don't lose them, just in case the tablet needs reset for any reason". And for that, you've even put a tag that already answers your question: adb. Follow up to its tag-wiki for some general hints (e.g. how to install a minimal version of it). Then see the backup tag-wiki and scan it for "ADB" (also check the linked questions there).

Basically, what you want to do is to adb backup the relevant apps. Such an ADB-Backup always includes the app's data, and optionally the .apk of the app as well:

# adb backup -f &lt;file_name&gt; [-[no]apk] &lt;package_name&gt;
adb backup -f myApp.ab -apk com.foobar.app


The only thing you need to figure first for this is the package name of the app you want to backup. Easiest way of doing that is checking its page on PlayStore, where the package name is part of the URL (id=&lt;package_name). Alternatively, e.g. the app AppInspector can help you find the package name.

If you later need to restore that, adb restore &lt;file name&gt; is all you need to call.