Despite being an application, they often have a file extension.

"I remember back in the day when file extensions had to be three letters."

Anyway, the point is that many of these different file extensions are going to be seen in the future, more even than we see now.

First, we'll take a look at how to file for a federal income tax filing extension.

The file extension is only there for the benefit of the user.

If you press F2 and change the file extension to .

The main file extension used by this program is .

But contributions have to be made by April 15, even if a filing extension is requested.

Generally when this is done a different file extension is used.

If desire had a file extension, it would be .

He has received a filing extension until Aug. 15 for his 1988 returns.

The file extension of pictures and films was there changed to ".

That is the date by which those who have received a filing extension must mail in their tax returns.

DD, if a file extension was used at all.

Though the intended file extension for this format is .

Change the file extension on each one to .

By default, 7-Zip creates 7z format archives with a file extension.

It supports over 150 file extensions (as of version 4.5.1).

Windows actually looks at the content of the file, not just the file extension.

In this key user can connect file extensions with programs that should use these files.

Microsoft Word documents have a file extension of ".

The file extension, the one, one which I saw was dot mum.

File extensions are usually three letters long and come after the name of the file.

I can't remember what the file extension is [.

So those have all been file extensions of either executable or interpreted code.