Saves objects to a text file in a format that is suitable for loading using LoadObjs. Handles is an array of object names. The type of the objects is specified by ObjectTypes. This can be done by entering only one object type in which case all objects handles should be of that type, otherwise individual types can be entered in an array that has a one to one correspondence with Handles. FileName is the full pathname of the file to save the objects to. The Append parameter is optional. If it is not specified then it defaults to 0 which deletes the current contents of the file before saving the objects. If Append is non-zero then the objects are appended to the file.