No. They can tell you what software the file was created by, or to be used by. It will not tell you which computer it was made on.
They're used as extensions to identify picture files.
The file extension is the two, three, or more letter code that is after the period in a computer file name. It is used to "tell" the computer what type of file it is and what program on your computer will "open" or "run" it.
File extensions tell the computer what kind of program was used to create it, and are usually three letters. Common file extensions are .txt .doc .wps
Windows hides file extensions in File Explorer by default for known file types to simplify the user experience and reduce clutter. This setting can be adjusted in the Folder Options menu, where users can choose to show file extensions for all files. The option is typically turned on for security reasons, as displaying extensions can help users identify potentially harmful files. To view file extensions, users can enable the "File name extensions" checkbox in the "View" tab of the Ribbon in File Explorer.
Program file extensions simply identify the type of program. For example, an executable program will have a file extension of .exe, and some music files will have the file extension of .mp3
For windows, you might use .cmd, .bat as common file extensions. Unix doesn't use file extensions as associations, so no file extension needs to be used in the Unix environment. A shell script in Unix is simply a text file with any name that is readable and executable. However, file extensions are typically used in Unix as a documentation aid that states that the file is a shell script. Common extensions are .sh, .csh, .ksh, .tcsh, .zsh, etc.
There are hundreds of filename extensions in use, and the set is constantly changing. The extensions are the characters after the period in dotted-name filename systems. They identify file types and serve to associate each with the application software that can properly interpret them. Please see the accompanying links for two Web sites that list file extensions.
Several video file extensions are used, which normally represent different file formats. Some of the commonly used extensions include AVI, MP4, MKV, but there are several others as well.
Computers use file extensions to determine a file's type.
Right click the file and click properties or you can go into the folder settings and tick show file extensions which will show the full name in Windows Explorer
File extensions just tell your computer which program it needs to open the file. They also tell you what sort of file it is, for eg: If you got an email and there was an attachement called Sarah.jpg because of the .jpg at the end you know it is a photo file.
File extensions tell us what kind of file it is.For example, a .pdf extension tells us that it is an Adobe Acrobat file.Files with the extensions of .jpg, .jpeg, .png, and .bmt are all picture files. (This is not an extensive list of picture files, just an example).Other types of files like .doc, .dot, .dotx, .docx, are Word files. There are many more file extensions for that.Powerpoint files have extensions like .ppt and .pptx.Windows media files have extensions like .wmv.Every software program has its own extensions that identify what it is.In Windows Explorer (or Apple equivalent), you can organize your files by file type if you're looking for a specific type of file. It's also really helpful if you're tracking statistics on file types and usage, or finding a file that you need to use again.The sort by file type feature is very handy when you have a high volume of files in a directory and you're looking for a document of a specific type.If you don't know where you placed your file, you can do a global search on the file type (if you know it) and your computer will give you search results showing only the files with that extension.