Sounds to me like you are having problems with the base ZIP file. The file you download is not the actual spreadsheet, it is a compressed version of it. You need to extract the actual spreadsheet from that file. Okay, lets try this:
First, right-click the file you have downloaded and see if the pop-up menu offers you anything related to "Extract". If so take that menu option and select the XLS file for extraction.
If your PC is utterly and completely blissfully unaware of what a ZIP file is them PM me on here and tell me your email address and I will email you the spreadsheet itself directly.
There is a program you can download that reads ZIP files, but I won't go into that here.
First, right-click the file you have downloaded and see if the pop-up menu offers you anything related to "Extract". If so take that menu option and select the XLS file for extraction.
If your PC is utterly and completely blissfully unaware of what a ZIP file is them PM me on here and tell me your email address and I will email you the spreadsheet itself directly.
There is a program you can download that reads ZIP files, but I won't go into that here.