Question

In windows OS, what are the limitations on the primary name of a file? ​

Answer 1

NTFS allows each path component (directory or filename) to be 255 characters long. Windows forbids the use of the MS-DOS device names AUX, CLOCK$, COM1, …, COM9, CON, LPT1, …, LPT9, NUL and PRN, as well as these names with any extension (for example, AUX.