Invalid file types (upload xls/xlsx)

Receiving invalid xls format in your excel workbook but unable to fix this error? Well you can fix this by trying manual as well as automatic solution. For manual solution you must try these steps:

Firstly you need to change the File Extension of Your Excel Sheet. Sometimes, the problem is occurred due to the unsupported file extension of your excel file. To check the support of xlsx extension, go to the ‘My Computer’. Browse ‘Tools >> Folder Options >> File Types’. Make sure that the ‘xlsx’ extension is included there or not. If not then rename this file and change ‘.xlsx’ to ‘.xls’.

Use Open and Repair option of excel:

For this, just open the Excel workbook and then go to ‘File >> Open option. Choose the file which you want to open but don’t make double tap on it. After then go to the ‘Open’ dialog box and then select ‘Open and Repair’ option from there. This process will fix the corrupt excel spread sheet and open it normally.
The chances are very less for the perfect conversion, but yes your damaged file could be recovered of course for sure.