Why Photoshop changes my photo viewer application back to default?

Im using Photoshop CC the portable version on Win10 and everytime I open it, i got several messages that all the image-based formate has been changed

I'm using Photoshop CC the portable version on Win10 and everytime I open it, i got several messages that all the image-based formate has been changed back to the default photo editing app.
I'm sorry if my explaination is confusing, i've never met with this problem before, and i tried to google it but nothing came up.

or:I'm using Photoshop CC the portable version on Win10 and everytime I open it, i got several messages that all the image-based formate has been changed back to the default photo editing app. I'm sorry if my explaination is confusing, i've never met with this problem before, and i tried to google it but nothing came up.

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