How can I change default app tp open a .jpg

My form allows to up load a picture and it is defaulting to html to open how can I change the default app to open attachments?

Thanks

Roger Luznar

For images submitted through your form the browser will be always opened since they are stored in a link, in case the image is downloaded to your computer then the default app needs to be changed on your device settings. 

Here are some links that may help you: 

http://www.idownloadblog.com/2015/05/15/how-to-change-default-image-viewer-mac/ 

https://www.online-tech-tips.com/windows-xp/change-windows-default-picture-viewer/ 

I hope this helps.