I am editing some VB code in my excel workbook that opens other excel files. The problem is that there are many other users of these files and some have Excel 2003 and some have Excel 2007 and some have Excel 2010. When the code opens the file filename.xls. It can't find the file when the newer versions of excel have saved the file and it is now filename.xlsm or filename.xlsx. Do I have to use file extensions in the code when opening and manipulating the file?
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