"Can't open file" when trying to open downloaded files?
My Galaxy S4 running on 4.3 will no longer open downloaded files. When I go to Downloads and touch the screen 'can't open file' appears despite the fact that I have Acrobat Reader installed in respect of pdf files and another viewer for other formats. This problem appears to have started in the past month. There is no problem so far as attachments to emails which open fine, its just files downloaded from websites.
re: "Can't open file" when trying to open downloaded files?
It looks like some have had [Only registered and activated users can see links. Click Here To Register...], but that may be unrelated. Have you noticed if it occurs with specific file types? You might try the 'clear cache' and 'clear data' options on the Downloads app and Download Manager and see if things behave normally after that.