The extension is used to identify the file type and enable it to be opened by the right software. By having extensions we can also give files that are related the same name in different applications. So you could have a file for finances in a Word document called Finances.doc and one in Excel called Finances.xls too. You can also estimate the versions of the software that created the file. Up to Excel 2003 .xls was used and since Excel 2007 .xlsx has been used.
File Extention
A file tree is extention to a file that branches out
The file extention is just .jpg The 128 x 96 is just a file size - it is NOT part of the extention.
A file extention isn't needed but when your the file has a file extention the computer can easily find the appropiate program to run it. If a file doesnt have a file extension the computer will require you to find the appropiate program with means more work for you to do
You're computer is regonising a file as an "Unknown File" only because it has no understanding of that file extention. Right click the file and select "Properties", find the extention name (Eg, .exe) and search for software that will read that extention name. If you're having further problems consult someone on a Technical Help Forum.
Emails are not files, so they do not have extensions.
common guys the answer for .dat is videos
A console is saved in a file with an .msc file extention, and a snap-in in a console can itself be a console.
*.txt. In reality the ascii file can have any extention. A ASCII file is just a raw text file with no enbedded codes within the file.
An Adobe Premiere video editing project file would usually have a .ppj extension.
It may have any extention. .exe ,.rar, .xls ,.mp4 etc
The file extention of any application on a computer is: '.exe' .exe = simply means executable.