HTTP is not a file, it is a protocol. It therefore does not have an extension. If you mean HTML files, which are web pages, then either htm or html can be used as extensions.
http://filext.com/file-extension/PRJ
There is list of programs that support DO file extension http://www.howopen.org/en/extensions/web-files/do
For individuals and families, the tax extension deadline is October 15, which gives you a 6 month extension of time to file your taxes from the April 15 tax deadline. You can file your extension online with an e-file provider like FileLater (http://filelater.com).
What is the file extension What is the file extension
Here is some information on how to file a tax extension: http://taxes.about.com/od/preparingyourtaxes/ht/FileExtension.htm. Form 4868 should allow you to file an extension for up to 6 months after the original deadline.
According to FileInfo.net, it is a Korg Instrument Bank File. http://www.fileinfo.net/extension/pcg
Automation file synchronization over LAN and WAN, FTP, HTTP, SMTP, POP3, PING. File
file extension for video is 101
The most common .dat files are video files from a video cd. Try playing with media player. See this also http://filext.com/file-extension/dat
.html, .php, or .htm
The file extension tells about the type of file, with the extension three letters. For Eg:- *.txt -- text file *.exe-- executable file
file extension