c# - File download and save locally windows phone -

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i m saving image local folder windows phone application

var localfolder = applicationdata.current.localfolder   var photofile = localfolder.createfileasync(("mani"),         creationcollisionoption.replaceexisting);

i m saving file without extension while save locally security reason , avoid other apps view.

when search google got api launch default apps file

windows.system.launcher.launchfileasync(photofile);

but local file dont have extension can't use api default application launch please guide me alternative solution this

thanks,


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