Excel utilities product warning

This warning mainly applies to Excel 2007 and 2010 users

Always open Excel files from within Excel or by direct file selection.
Do not attempt to open a new instance of Excel's Application when opening files, 
not only is this wasteful on memory but will cause issues with the add-in when information is being saved. 
If Excel has two or more applications open, with access to the same add-in file, and the save command is activated, 
Excel will attempt to save backup copies of the add-in to the documents folder as both xlam and xlsm files.
 
Excel 365 (2013-2019) is free of this issue, provided that you do not open Excel as an administrator when Excel is already open.