Hi @meb58,
I suggest that the first thing you do is to set your default template file in AutoCAD LT 2017. Please start the program and then type OPTIONS. In the Files tab there is a section called Template Settings. Expand that to see the Default Template File Name for Qnew. Assign a template from your AutoCAD 2017 installation such as ACAD.dwt or ACADISO.dwt.
This should take care of opening the incorrect templates inadvertently.
As Dean pointed out in his post, the file format is the same across 2014-2017 versions. Make sure that when you save your files that you are saving in 2013 format.
As far as having to create a folder to save your drawing files from AutoCAD LT 2017, this is a Windows operating system issue as AutoCAD does not control this functionality. Please check to see that your user account has administrator permissions. Are you working off an external drive of some sort or a network?
To start drawings, click on the Start Drawing area on the Start screen and optionally drop down the templates menu to select which template you want the new drawing to be based upon.

Please select the Accept as Solution button if my post solves your issue or answers your question.
John Vellek
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