Signtool error: No certificates were found that met all given criteria with a Windows Store App?

Question

I\'m trying to sign a Windows 8 appx package with a pfx file I have. I\'m using a command like so:

signtool.exe sign /fd sha256 /f \"key.pfx\" \"app.appx\"
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Answer 1

I had this problem and I'm not entirely sure which step below made it work, but hope this helps somebody else...this is what I did:

• Install the downloaded certificate (.crt) into certificates (I put it into “personal” store) - right click on .crt file and click Install Certificate.
• Run certmgr.msc and export the certificate (found in whichever store you used in the 1st step) as a pfx file including private key, and extended properties (probably unnecessary)
• Use the exported .pfx file when signing your project
• Example signtool: signtool sign /f "c:\mycert.pfx" /p mypassword /d "description" /t http://timestamp.verisign.com/scripts/timstamp.dll $(TargetPath)
  where the password is the same as provided during Export