Windows 10: This app can't open - installing appx files via Windows PowerShell certificate is signed

dont tell me to upgrade to windows 10 - not doing that, just tell me what I did wrong and how can i fix this errorI installed Microsoft Minesweeper by using the guide to sideload appx files here:https://rentry.co/Win8Sideloadafter i try to open it it gives me the error seen in the picture below.I have tried every possible thing to fix this problem but nothing helped such as installing updates.The certificate of this is already installed. I repeated the process on installing it 3 to 4 times and I still got the same error. I don't know what I have done wrong. Please tell me what I can do to fi

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How to extract ".cer" file from a given ".appx" file?

I would like to extract ".cer" file from a given ".appx" file and wonder if anyone knows how to do that.

As context, the thing I want to achieve here is installing certification for the appx file in PowerShell (I can manually install it from Properties > Digital Signature > View Certificate > Install Certificate) and do it in PowerShell as command line actions.

 

How to sign Powershell profile w/ self-signed certificate?

I currently have my execution-policy set to AllSigned. I don't want to change it or bypass that restriction.

When I created my profile script--or whatever it's called--I wanted to do so in order to set permanent aliases.

For whatever reason, Microsoft has made it an ever increasingly difficult endeavor just to create permanent aliases.

The problem now is that it won't run the script because it isn't digitally signed.

I attempted to make a self-signed certificate to sign the blasted thing but I never got anywhere.

I've looked at a few guides online but they all assume I'm in a server environment or something (which means the steps keep changing or involve unnecessary steps).

In the end, I wound up with a code-signing cert and the thing is in my current-user cert store.

I'm trying to get this to work on my Windows 10 Pro desktop but I haven't a clue as to what I'm actually supposed to be doing.

Is it even possible to get what I'm asking for? *Confused

P.S. - I have no experience with either Powershell or certificates. The only reason I know what I've mentioned so far is because I spent 2-3 minutes glossing over the help files. My knowledge of PKI has me understanding that you need a private key to sign something, but I can't even get the certificate to validate my own key so it's kind of getting me flustered at this point.