Excel utilities product warning
This warning mainly applies to Excel 2007 and 2010 users
If you choose to use this add-in, then you must always open Excel files from within Excel or by direct file selection.
Do not open a new instance of Excel's Application just to open another file, this is not only wasteful on memory but will cause issues with the add-in as the program stores and saves information within the add-in file. If Excel has two applications open, with access to the open add-in file, and the save command is activated, Excel will attempt to save copies of the add-in to the documents folder as xlam and xlsm file extensions for you to clean up.
Excel 365 (2013-2019) is mainly free of this issue, as long as you do not open another Excel as an administrator at the same time.