if you list the paths and filenames of the files you want to merge (eg- "C:\part_1_of_film_to_join.mpg" + "C:\part_2_of_film_to_join.mpg")
then write the path and filename of the finished, joined movie u are trying to create (u can call it whatever u want and choose wherever u want the file to be created)
so in this example all u need to do is write this in the cmd window..
copy /B "C:\part_1_of_film_to_join.mpg" + "C:\part_2_of_film_to_join.mpg" "H:\joined_up_file_created.mpg"
i hope that makes it clearer.
It works best on my old and crumbling computer if you only join a few parts at a time - if i try to combine too many like say 15 parts, the size of the finished, created file is huge as it should be but the film only lasts a few minutes - even less than the first part i tried to join. so i just join up 5 pieces at a time so my tiny processor can cope, maybe that is happening to u sameway.