public string RenameSubfile(string subfile, string newName)
{
int index = FindSubfile(subfile);
if (index < 0)
{
throw new Exception("Couldn't find the subfile " + subfile);
}
newName = newName.Trim();
if (!Utility.ValidFilePath(newName))
{
throw new Exception("The name is invalid");
}
if (FindSubfile(newName) >= 0)
{
throw new Exception("A subfile with " + newName + " already exists");
}
Parser.Subfiles[index].Name = newName;
return(newName);
}