Four months ago I send them an email and got reply:
Dear xxxx xxxx:
Thank you for your inquiry about connecting your PowerShot SX280 HS to your Windows phone.
At this time, there is no app that allows you to connect your camera to your Windows phone. There is also no official notification, at this time, that this capability will come to our cameras.
Please let us know if we can be of any further assistance with your PowerShot SX280 HS.
Thank you for choosing Canon.
Sincerely,
Robert
Technical Support Representative
Anyone out there please send an email to Canon and ask for Windows Phone app. I think they will eventually start supporting it after they acknowledge the need.