This question is a bit vague. However, in order to rename files within the system32 directory, you first need to have local administrative rights. Additionally, the file typically cannot be in use. If this is a file from a virus, it typically will be in use and may not be able to be renamed without first ending whatever process has the file locked.
System32 dll file locates in C:\WINDOWS\system32. You can directly install it in C:\WINDOWS\system32.
Linux does not contain anything called "System32" by default. You would remove a file called System32 by entering rm System32. You would remove a directory called System32 by entering rm -r System32.
Renaming files means changing the name of files. This can be done by pressing on the file icon once, then pressing on the file's name which will allow you to then change the name of the file.
the SAM file in the config folder of system32.
by renaming the file with .man
You can file dll file in C:\WINDOWS\system32.
You can find karasX2.dll file in Windows System32 file.
easier to locate what you are looking for
File extensions can be changed just by renaming the file. For instance, mv filename.txt filename.doc