I'm not sure about converting quicktime movies into other formats... I'll look in the dark corners of the web and see what utilities I can find to compromise Apple's video encoding... I think quicktime pro can save movies in .avi format, which are easy to get coverters for to make them other formats including media player's .wmv
As far as combining clips for media player... if they are in .mpg or .mpeg format, you can make your own clip combiner...
1. Create a new text file and rename it from "New Text Document.txt" to "mpg.bat" or "combine.bat" or something similar... just use the .bat extension... then right-click on that file and choose "edit"... type the following:
copy /b *.mpg new.mpg
copy /b *.mpeg new.mpeg
Then save the file and put it wherever you want...
2. To combine the clips, copy the .bat file into an empty folder along with the clips you want combined... make sure they are named in alphabetical/numerical order so they will cobine properly.... then just click on the .bat file to combine them... the new file will be named "new.mpg" or "new.mpeg", depending on which file extension the original files had.
3. Rename the new file appropriately.
BTW, this technique does not work for .avi files (they will not play)... nor for .wmv files (you will only see the first clip, nothing after).
Info for those unfamiliar with .bat files... a .bat file is from the older MS DOS operating system.... it is called a 'batch' file because it runs a batch of commands which are listed inside it.... was/is very handy tool for cutting down on manually typing commands at the C:\> prompt, as in the case of autoexec.bat which is called to execute its listed commands during boot-up of all DOS and most Windows operating systems.