21 thoughts on “How to solve excel cannot open the file … because the file format or file extension is not valid.

  1. I am going to make this video again in english on the request of my viewers dont forgot to Like,Comment and Share this video !
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    Thanks for watching!!!

  2. sir mero excel file khuliraxaina ma office 10 use garxu ra maile tapailai excel file pani mail gareko xu plz help me sir..

  3. I want to remove " file is already open", dialogue box, while my c# project is read continue this file. xls formate

  4. bro i want to open an excel file but a massage will.appear that " the file you trying to open (file name.xls) is in a different format than specified by the file ext. Verify that the file is not corrupted and is from a trusted source before opening the file." Do you want open it now?. . . . . . plz guide me about it that how can i open it?

  5. Dear Sir i have one important file can't be open kindly need help urgent please i try as per the video but not opening kindly help any one plzzzzzzzzz this is important for me

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