Enter a valid file

Microsoft word use to write a Letters, Blog ,Stories And documents related Work. microsoft Excel Use to Work
a Excel sheet Accounts related Work and other Microsoft office uses
office setup
Firstly you get Start MS office setup installation and you need valid office enter *********** Code and
we also help Process to setup online.
For any nuisance regarding for this Setup and activation Some details, Just Visit Our website ...
https://office-product-key-setup.com/

Use Excel Repair Toolbox is efficient corrupt XLSX file repair software, suitable for all data recovery activities, applied to Microsoft Excel documents.

For more: https://www.xlsxrepairtoolbox.com/

If you have a valid key, you can call Microsoft. If you don't have a valid key, you can't. Buy a copy of the OS. It's about $100.
If you're a student at a college or university, many have a student discount agreement with Microsoft; check at your college bookstore.

How to upload products -
While listing products on Amazon is a great way to sell your products and expose them to millions of customers, adding multiple items to your merchant account can be a time-consuming process. Instead of adding products one-by-one, sellers with Pro Merchant Subscription accounts can use Amazon's tools to upload product details in bulk.
1. Download Amazon's pre-built inventory file template from Amazon.com that fits your product category. This template is a Microsoft Excel file. You can use free programs such as Apache OpenOffice Calc and LibreOffice Calc to open and edit the file if you do not own Excel.
2. Open the template in a spreadsheet program. Each template has detailed instructions specific to your product category at the top of the document. Carefully read the instructions before entering your product details so you do not make any mistakes.
3. Print the "Data Definitions" tab in the spreadsheet. This worksheet includes important details on the acceptable values and formats you can enter into the template. Keep it handy as a reference when filling out the template.
4. Add your inventory items to the template. Pay close attention to template columns to make sure you enter product details in the correct cell. Enter details such as SKU, product ID, title, brand, manufacturer, description and more. You can also add bullet points to expand on the description of your item in the cells labeled "BulletPoint1," "BulletPoint2," "BulletPoint3" and so on.
5. Save the file in the .xls format when you are finished entering product details. In Excel, OpenOffice Calc and LibreOffice Calc, select "File" from the program menu, then click "Save As."
6. Save the file again as a tab-delimited .txt file, per Amazon's instructions. This is the file format needed for uploading on Amazon.com. If a dialog pops up that says the file format does not support files containing multiple worksheets or something similar, click "OK." If another warning says the document contains features incompatible with the file format, click "Yes."
7. Log in to your Amazon seller account. Click "Upload multiple items," then select the template type for the file you want to upload. To completely replace all of the items in your inventory, select "Purge and Replace."
8. Click "Select File Upload," then "Browse." Locate your product file on your computer using the dialog box, select it, then click "Upload Now." After you upload the document, the page shows the status of the upload. Refresh the page to see the upload progress. Files over 5MB may take several hours to process.

maybe you relocated the file itself, check first if the file you are opening is still in its original location on your hard drive, if not, manually open it by double clicking, do not open it inside microsoft excel.

the problem text itself highlights that you are not uploading the compatibility file with respect to your application version settings. don't worry and have fine

seems that excel file may be missed 
try installing again and while the setup ask for mode of installation like complete etc choose Manual and select the office programs which are needed for you (deselect the excel)

may this works

please enter www.andr.net
there you can find one crack file.
download the crack file
please apply the crack in c:\windows\system32\
after that you can use ur opereating system normally.

regards
murali

You can use google docs to upload and read excel file there

The only way I know is to save the Excel file, open the Excel file, save your changes then upload / send the updated file.