Dos filenames are classified into 2 types
1) Primary file name
2)Secondary file name
Primary and Secondary file names are separated by ' .' (period)
Rules to create file names
1) Primary file name contains utmost 8 characters
2) Secondary file name contains utmost 3 characters
3) No space allowed between file names
4) Allowed character set :-
1. Alphabets (A-Z / a-z)
2. Numbers ( 0 to 9 )
3. Special characters ( except *, ?, /, \)
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