C#

public bool IsManaged(string filePath)
{
	byte[] Data = new byte[4096];
	FileInfo file = new FileInfo(filePath);
	FileStream fin = file.OpenRead();
	int read = fin.Read(Data,0,Data.Length);
	fin.Close();
	// Verify this is a executable/dll
	if ((Data[1] << 8 | Data[0]) != 0x5a4d)
		return false;
	// This will get the address for the WinNT header
	Int32 iWinNTHdr = Data[63]<<24 | Data[62]<<16 | Data[61] << 8 | Data[60];
	// Verify this is an NT address
	if ((Data[iWinNTHdr+3] << 24 | Data[iWinNTHdr+2] << 16 
		| Data[iWinNTHdr+1] << 8 
		| Data[iWinNTHdr]) != 0x00004550)
		return false;
	Int32 iLightningAddr = iWinNTHdr + 24 + 208;
	Int32 iSum=0;
	Int32 iTop = iLightningAddr + 8;
	for (int i = iLightningAddr; i < iTop; i++)
		iSum|=Data[i];
	if (iSum == 0)
		return false;
	else
		return true;
}