Hi,

I assume you can work with Executable action in an IAS.
Example of a C# script which opens a PDF when executed:

using System;
using System.IO;
using Skyline.DataMiner.Automation;

public class Script
{
public static void Run(Engine engine)
{
UIBuilder uib = new UIBuilder();
uib.AppendBlock(new UIBlockDefinition
{
Type = UIBlockType.Executable,
Extra = @"http://dcpdma.skyline.be/Documents/DMA_COMMON_DOCUMENTS/test1/TEST_DOC.pdf",
});
var res = engine.ShowUI(uib);
}
}

This example should lead you to the right direction of what you want.
Note: the file must be public accessible from the system.