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
A primary key is one that uniquely identifies a record . Also there are cases when primary key of one file appears in another file. In that case the key is called Foreign key.
attachedmemt
file class contain methods or functions that handle various file stream operations.
yep foreign key can have duplicate values
a file name can contain any type of character, it can be start from any character,number& can start with symbol also.
Heres three that i found fugal, fugitive, refugee that's all i got sorry. I know you need five but this will give you a good start.
Yes you can there is no law stating that you can not marry a fugitive but if he has not been caught at this time when you file the paperwork it might show up and he might just get arrested when you to are married but if he is already in jail you have the right to marry whoever you want.