A .taxform file is a draft copy of a tax form saved in the file location in a folder called (Company File Name) Tax Forms.
The draft form contains any data that was started and the Save and Close button was pressed on that tax form.
The only way to open this file is through QuickBooks by selecting the same form to open and then to press the Open Draft button after the form is selected.
If this dialogue box does not display, a final version of that form has already been published and the .taxform file cannot be opened.
Examples of these forms are INWKS940.taxform, W2INTRV1.taxform and WKS941RA.taxform. These are draft forms for the 940, W-2 and 941 respectively.