AmmarPack is a freeware tool than can be used to collect and "pack" multiple files in a single one! And of course reverse the procedure to extract the data you packed :)
It is more of a tool for programmers (since there is no GUI , everything is written in script.txt) , it is perfect for batch `file gathering` , you can back-up directories , make packed installation files and generally organize your stuff. You can pack huge volumes of files with just 3-4 lines of code.
Just make your program open and write to script.txt in plaintext and then call ammarpack.exe No compression is yet implemented , but a future version may also feature a ziping algorithm. Finally you can integrate Windows and AmmarPack with the AmmarPack Tool.exe and make .apf files extract and your .apjobs executed with a double click.