There is no field that contains the full URL to a product's More Info Page, however there is the More Info Page Filename field that can contain the filename, if you have given the product a specific filename. If you have not assigned the product a specific filename, then this field will remain blank and the filename will be assigned as product[record_number].html. In v8.1 and newer you can download the record number in the 'Product ID' column.
So if you product has 'filename.html' in the Filename column of your downloaded products file, then the full URL would be something like:
http://www.yourdomain.com/store/filename.html
If your product has is blank in the Filename column, and the Product ID column has '123', then the full URL to your product would be something like:
http://www.yourdomain.com/store/product123.html
-Loren