zhikuili1997Copper ContributorNov 05, 2019when I open Excel file, it always show"the file format or file extension is not valid. Verify that the file has not been corrupted and that the file extension matches the format of the file.
SergeiBaklanDiamond Contributor to zhikuili1997Nov 05, 2019zhikuili1997 Duplication of https://techcommunity.microsoft.com/t5/Excel/can-t-open-Excel/m-p/985496
