Old Merge Documents linked to the wrong Merge Data file(Action_Merge.txt)

Didn't know how to change the VBA Macro programming to link it to the new Merge Data file (MergeData.txt)
Opened new Merge Document (Sample Merge.doc) that's linked to the correct Merge Data file (MergeData.txt), copied and pasted old merge document's data (Estimate.docx) to new Merge Document (Sample Merge.doc)
Went to save document was presented with this compatibility warning:

I opted not to select the checkbox for compatibility. Clicked "Ok."
I was then presented with this Macro-Document warning:

Went back to Save As, and from the dropdown menu selected "Word Macro-Enabled Document" (.docm). And then saved file.
I then went into Sesame Designer > Forms > (Form) > Program Layout > cmdPrintMerge > and changed this bit of code (to include .DOCM):
var vDocType as string = ".DOCx;.DOC;.DOCM"
It now works wonderously. The current MergeData shows up everytime in Microsoft Word.