C#

using Microsoft.Win32; // to access the reg
using DSSharedObjects; // generated with : tlbimp.exe DEVSHL.DLL

public static string[] ImportFilesFromMSDev()
{
	ArrayList AL = new ArrayList();
	try
	{
		object[] Objects = GetActiveObjects("MSDEV.APPLICATION");
		foreach( object Obj in Objects )
		{
		DSSharedObjects.IApplication App = Obj as DSSharedObjects.IApplication;
		if ( App==null ) continue;
		DSSharedObjects.IDocuments Docs = App.Documents as DSSharedObjects.IDocuments;
		if ( Docs!=null && Docs.Count>0 )
			foreach ( DSSharedObjects.IGenericDocument D in Docs ) AL.Add(D.FullName);
		}
	}
	catch{}
	return AL.ToArray(typeof(string)) as string[];
}


[DllImport("ole32.dll")]
private static extern int GetRunningObjectTable(int reserved, out UCOMIRunningObjectTable prot);

[DllImport("ole32.dll")]
private static extern int CreateBindCtx(int reserved, out UCOMIBindCtx ppbc);


private static object[] GetActiveObjects(string ProgId)
{
	ArrayList objs = new ArrayList();
	UCOMIRunningObjectTable prot;
	UCOMIEnumMoniker pMonkEnum;

	GetRunningObjectTable(0,out prot);
	prot.EnumRunning(out pMonkEnum);
	pMonkEnum.Reset();
	int fetched;

	UCOMIMoniker []pmon = new UCOMIMoniker[1];
	while( pMonkEnum.Next(1, pmon, out fetched)==0 )
	{
		UCOMIBindCtx pCtx;
		CreateBindCtx(0, out pCtx);
		string str;
		pmon[0].GetDisplayName(pCtx,null,out str);
		
		try
		{
		RegistryKey Clef = Registry.ClassesRoot;
		if ( Clef!=null )
		{
			int P1 = str.IndexOf('{');
			int P2 = str.IndexOf('}');
			if ( P1>0 && P2>P1 )
			{
				string ClassHive = @"\CLSID\"+str.Substring(P1,P2);
				RegistryKey SK = Clef.OpenSubKey(ClassHive+@"\ProgID", false);
				if ( SK!=null )
				{
					string Val = SK.GetValue("") as string;
					if ( Val!=null && ProgId==Val )
					{
						object objReturnObject;
						prot.GetObject(pmon[0],out objReturnObject);
						objs.Add(objReturnObject);
					}
				}
			}
		}
		}
		catch {}
	}
	return objs.ToArray();
}