The View Drawing is pulling in the representation file associated with the Drawing that is related to the Part. OOTB the recipe file to generate drawing representations is HPGL (plt files). If the recipe file used to publish the drawing representation is changed to output PDF files then PDF files will be published as the representation and that will be opened when you use the View Drawing app.
Also, per the PTC Navigate Guide (p. 41):
This app automatically downloads the drawing that matches the number entered.
The file format downloaded is based on the order you specify in the File Formats
field. For example, if the number matches both a PDF and DXF file, the PDF file
is returned when it is listed first in the File Formats field.
Therefore, if both drawing formats are found when viewing the representations (plt and pdf), the file downloaded will be based on the preference set in the app properties.
thank you for your quick response.
I hoped for an option that lets users choose between different formats, i.e. a plt or pdf file, as long as all of them are connected to the drawing in Windchill.
This would allow the user to choose whether to work with the plt or the pdf file, depending on the task.
However knowing how it works will help me configure it the way i want it to distribute the files to the users.