Two are WinRar and 7-zip. Both are free and easy.
you need to have a program on your mac that can open doc files. an example of a program that can open Doc files is...Openoffice (This program is free) or Pages (not free) for mac.
openoffice, download the program for free, and you can create .doc files (word files) , but first read about how to use the program on the open office website.
There are many programs that will open power point files. Perhaps the most widely known is Open Office, which also has the virtue of being open source and therefore free.
On Windows, you can use this free and simple program Free HD Video Converter Factory to convert your M4A files to WMA. > Open the program and add your .m4a files. > Select WMA as the output format. > Export the converted files. Other free options include Audacity and VLC Media Player.
There is a program known as "calibre" that should be capable of opening and reading non-DRM.lit files. There is also a command-line utility in most repositories known as "convlit" that can convert them to HTML files.
open p7s file
You can use Audacity, a free, open source program that allows splitting (and joining) of audio files, among other sound editing features.
The free downloadable program BitLord is an open source software client for BitTorrent. It is easy to use and allows someone to participate in file sharing.
download the program called tuxguitar. you can open guitar files made with ANY software in this program. its free. have fun =] -Kyse
Winzip opens files which are of the format .zip .
If the files do not have pictures and Windows cannot open the file, you will need to download a program that is associated with the file. Some files, like PDFs, require a special program to open them.
Download the files in a different program. Or "open" it in a different program.