getting Excel cannot open the file because the file format or extension is not valid error message trying to open the 2021 download PRC2021.0-ty6bfe.xlsx
Please see the note at the bottom of the Get PRC page on the website. This is a problem with the Firefox browser that can be worked around by using a different browser, by saving the file and then opening it, or by deleting the .xlsx extension prior to opening the file.
I had this problem, found the note about Firefox and and then googled how to change the extension (my Firefox had downloaded as an .xlsx and had a setting to hide the extension from view).
I changed the extension to .xlsm and am now able to open.
Just downloaded 2021 Gold, had this file extension issue, checked the forum and found a solution.
Every year the new PRC version keeps getting better, so I'm looking forward to this one. The forum is a great addition.
Thanks Stuart!
