Excel cannot be open the file 'filename.xlsx' because the file format or file extension is not valid - Microsoft Community Hub
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javascript - File extension or file is not valid at the time export excel using spout library in php - Stack Overflow
Excel cannot be open the file 'filename.xlsx' because the file format or file extension is not valid - Microsoft Community Hub
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Excel cannot open the file because file format or file extension is not valid - Help - UiPath Community Forum
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