Extension
a file name can contain any type of character, it can be start from any character,number& can start with symbol also.
Enclose the filename in double quotes
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.
In alphabetizing, "the" is almost always left out. It would be under "S."
.txt, or a text file can always be opened by an application.
Limewire doesn't always give your computer viruses. You would get a virus from Limewire if you downloaded a file with a virus in it. But if you use Limewire, you need to be really careful. A lot of Limewire's files contain viruses. Not every single one of them, but a lot of them contain a virus.
The simple answer is that Unix does not use extensions for program associations. Everything in Unix is a file, whether it is a device, a data file, or a program. In Unix it is controlled by permissions, primarily the execute permission.Also, by checking the first block of a file for its content we can determine what program to use with a file (usually in a graphical mode).
attachedmemt
file class contain methods or functions that handle various file stream operations.