![]() ![]() WinRAR is a popular program to use although free unarchivers exist. RAR (.rar file) – A proprietary format second only to.lzh file) – This is now used on multiple operating systems and is a standard on Amiga systems. GNU Zip (.gz file) – Used on many *NIX operating systems.The free 7-Zip program can also handle many other formats. 7-Zip (.7z file) – A popular archive format.Some are operating system dependent and others have versions for multiple operating systems. There are a variety of programs that compress and decompress files. However, you should keep a copy of the original archive file just in case you need to install it again in the future. Once you’ve completely installed the program, and you are sure that it works properly, you can go back and delete the various installation files from your temporary subdirectory.In these cases, you can simply create a permanent directory for the program, and copy the files from your temporary directory to the permanent program directory. Some programs do not require any additional installation process.If you see an instruction file we recommend you read it first, to determine what steps are required to actually dearchive, install and/or launch the program. Most decompression programs have the capability of displaying the contents of the archive and extracting/viewing single files in the archive. It is usually called README.TXT, INSTALL.TXT, or some other similar file. Most archives with multiple files in them will have a text file with directions. If the compressed file has a folder structure inside the file you may have to let the utility create this folder structure on your hard drive. Use a decompressing utility on the downloaded file.That way you always know where the file is and you can always move it from there to a more permanent location when you are finished with it. For example, I have a subdirectory on my hard drive named \TEMPDOWN which I use strictly for downloading and decompressing files. It is best to save the file to a temporary directory that you’ve created just for this purpose.If you are using Netscape, it may say “No Viewer Configured for File Type…” just choose the save or save to disk option. In Firefox you will also be given an option to save to disk. In Internet Explorer choose the save to disk option from the download dialog.Download a file simply by clicking on its filename (or on whatever link the author has provided).Plus, probably as many other reasons as there are formats :-). And, some people just like to develop something “new” in order to leave their stamp on the industry. ![]() Another is competition companies try to develop new and “improved” formats to get the last little bit of fat out of the compression in an attempt to become the “next standard.” The type of file compressed has some bearing on the format of the file being compressed as well pictures and text often get better compression ratios using different compression techniques for each. One is simply that different formats were developed for different operating systems over time and these legacy formats continue on today. Why so many? There are a variety of reasons. You may have noticed in files you’ve encountered, been sent, or just seen written about that there are many different compression formats each with their own different file extension and compression algorithm. If, for example, multiple files need to be in multiple directories (folders) in order to correctly work on the receiving computer then one characteristic of such an archive would be to keep that directory structure intact within the archive and having the decompression program maintain the directory structure when decompressing the archive. By performing this combination process the archive both serves to make the transmission faster for all the files and manages to keep them together for convenience.įinally, the next step after combining multiple files into a single archive is to maintain the organization of those files once inside the archive. The next step to compressing a single file is the combining of multiple files into a single compressed archive. Of course, when compressing a file and sending it to another computer that computer has to have a program that will decompress the file so it can be returned to “normal” and used. The compression basically makes the file smaller and, therefore, the sending of the file is faster. File compression is commonly used when sending a file from one computer to another over a connection that has limited bandwidth. ![]()
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