On Mon, 29 May 2017 23:10:04 -0400
Scott Kostyshak <skost...@lyx.org> wrote:

> On Tue, May 30, 2017 at 09:30:45AM +1000, Charlie wrote:
> 
> > Yes, Sorry. should have been clearer. I go into webmail of my
> > Internet Service Provider and the .pdf created by LyX has the
> > WARNING [below] message before opening.  
> 
> Ah I see what you mean now.
> 
> > Look; it's really just a thing that I thought was a bit weird and
> > imagined that someone else had this problem with a .pdf constructed
> > by a LyX converter?  
> 
> I agree it's weird. The following
> 
>     $ file sample.pdf 
>     sample.pdf: PDF document, version 1.5
>     $ mimetype sample.pdf 
>     sample.pdf: application/pdf
> 
> makes me think that the file is correct and that the webmail from your
> ISP is having trouble with the identification.
> 
> Indeed, I've read that determining the type of file from the file
> itself can be tricky. See also:
> 
>     https://en.wikipedia.org/wiki/Magic_number_(programming)
> 
> Scott

Thank you for the link.
Charlie
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