How to make PP refuse to open anything but presentations

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Guest

In later versions of PP one can open a lot of different filetypes. Whether they make sense or not PP opens them without protesting. Is it possible from a .NET application through automation to make PP temporarily ignore any installed file converters and only open PP presentations. Even if some other file format has been renamed to an extension .PPT
I have made an application that can get into trouble if the file opened isn't a presentation.
 
In later versions of PP one can open a lot of different filetypes. Whether they make
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sense or not PP opens them without protesting.

What file types, specifically? Generally, if you File, Open something it can't handle,
you get an error message (whether that'd produce a programmatically trappable error or
not, I don't know)
ignore any installed file converters and only open PP presentations. Even if some other
file format has been renamed to an extension .PPT

Again, this should simply produce an error in most cases, although it may be able to
open some html files renamed with a PPT or PPS extension.

Many file types have some sort of recognizeable signature in the first few bytes;
sometimes this is optional, other times required. ZIP, TIFF, usually EPS/PS and many
other types should be fairly easy to trap by reading and examining the first few bytes.

You might find that PPT also IDs itself this way - I don't know. It would make things
quite simple, if so.
 
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