I\'m developing an app for Windows Phone 7 and I\'m using a Phonegap template for it. Everything looks perfect, but now I’m stuck trying to open a PDF file in the browser. I
You cannot open pdf files from the isolated storage in the default reader for PDF files. If the file is online e.g. it has a URI for it, you can use WebBrowserTask to open it since that will download and open the file in Adobe Reader.
On Windows Phone 8 you actually can open your own file in default file reader for that extension, but I am not sure how that will help you since you target PhoneGap and Windows Phone 7.