Any file name can not contain /, \, *, ?, :, |, ", < or >..
Yes
yes
A file cannot (in general) contain other files or folders in the traditional sense. A zip or other archive file can contain other files or folders and a document file can have a file in it as an embedded object, but these are special applications.
Extension
attachedmemt
file class contain methods or functions that handle various file stream operations.
a file name can contain any type of character, it can be start from any character,number& can start with symbol also.
No, just the HTML file. If you include the tag, it will cause a syntax error. The best way to think of it is that the HTML file already has the tag in it, and the external JS file is inserted into the HTML file at that point, between the tags.
attachment
which file extension is mos likely to contain malicious codes, .doc,. bat, pdf,.jpg?
Details about the file can be found out in the properties tag. The properties tag contain all the information about the file.