Var pdf as FolderItem = SpecialFolder.Desktop.Child("test.pdf")

// open PDF in Acrobat Reader on Mac:

// find app
Var bundleID as string = "com.adobe.Reader"
Var app as FolderItem = LaunchServicesFindApplicationForInfoMBS("", bundleID, "")

if app<>nil then
  
  // launch app with parameters
  
  Var docs() as FolderItem
  docs.Append pdf
  
  Var param as new LaunchServicesLaunchParameterMBS
  param.Defaults = true
  param.Application = app
  
  Var x as FolderItem = LaunchServicesOpenXMBS(docs, param)
  
  // on failure, simply launch it
  if x = nil then
    pdf.Launch(true)
  end if
  
else
  pdf.Launch(true)
end if