The file extension, or file suffix are terms that stand for the end of the file, but this is not the content of the file meant.
It refers to the file name, for example "new text file.txt" that *.txt is the file extension, so the last part behind the last point in the name. NewTextFileExamlpe2.txt
1.) ... General info file extensions and file suffix!
2.) ... The executable file extensions and file extensions!
3.) ... What should I pay attention to file extensions and file suffix?
4.) ... Are there any other methods of file detection if file name is damaged?
5.) ... Further information on file extension!
However, there are several programs and services that also use extension to be recognized as such. Usually, or more commonly, it is the EXE file, formerly MS-DOS, now for Microsoft Windows.
Today's operating systems use the file extensions (file type) to assign the program to which a file type should be opened. The file format is then read and interpreted by the respective applications, on Windows, MAC, Linux and also on Android smartphones and iOS on iPhones.
Yes, there is the so-called file header (English Fiele header), this is stored at the beginning of the file content, thereby the system, or the user can also check which file type it really is.
If you can open it in for example text editor, or hex editor, you can see it, here in the example a jpg file in Notepad
FAQ 54: Updated on: July 8th 2018 18:49