How open PDF file

Fine then
Developer option is not enabled I believe

In use application activity mention the filepath in this property
Arguments - If the application is not a web browser, you can specify parameters to pass to the target application at startup. You can use this property to open a specific file with the application. For example, if the target application is Acrobat Reader, you can open a specific workbook by providing the full path to the file. To open the file C:\Sample.pdf, enter "C:\Sample.pdf". Certain application types are automatically identified and autofill the Arguments property, such as Java apps, Office Suite apps, Adobe Acrobat, or Windows File Explorer

File path - If the application is not a web browser, specifies the full path of the executable file to open. If a file path is specified, the URL property is cleared.

Ideally for you it’s arguments

Check this doc for more understanding

https://docs.uipath.com/activities/other/latest/ui-automation/n-application-card

Cheers @sullivanne

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