How to make a custom file extension?

Question

Windows

Is it possible to make a non-standard file extension without third-party software? For example: .file , .bitcoin , .toster or .aye etc. If not, can you tell me what software you use for this task?
UPD
it turned out to create a file using the console with such a command (there are many of them) - cd. > .bitcoin

Answer 1

??? And what not?
If we are talking about Windows Explorer (aka File Explorer aka Explorer), press RMB -> New -> Text Document , rename the file. If the extension is not shown, somewhere in the menu there should be a button Change folder and search options , open the View tab , disable the checkbox Hide extensions for known file types .
If we are talking about modal windows Save file , select All files as File type and write the file name with the extension (test.test).
And at the level of the Windows kernel, there are no restrictions on non-standard extensions at all. And there seems to be no 8.3 anymore .

Answer 2

You will probably laugh, but sometimes I do it with a regular winrar

Answer 3

There are no standard extensions.
There is a file name separated by a dot for convenience.
There are applications that open and recognize as "their" only files with certain extensions.
You can safely name the files vasya.pupkin or egor.viktorovich
If you go to the control panel - default programs, then you can specify which program to open certain types of files.
For example, you can specify that all files with the .viktorovich extension should be opened with notepad, and all files with the .muzon extension should be opened with a media player.

Answer 4

Maybe I misunderstood the problem. No name, just an extension!
For example: .file, .bitcoin, .toster or .aye, etc.

what is holding you?
take notepad and create any file. Though without a name, at least without an extension.

Answer 5

Create a file, rename it like so
.gitignore.
That's right, with a dot at the beginning and at the end, and voila - you have a .gitignore file
On Windows, you really can't just leave a filename blank.