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Installing and updating applications
User Guide
Caution
Windows File protection
Installing a program might overwrite shared system files such as dynamic-link libraries (DLL files)* and executable files (EXE files).
When system files are overwritten, system performance becomes unpredictable, programs behave erratically, and the operating
system can fail.
Never delete files with the following extensions: SYS, DLL, OCX, TTF, or FON.
In Windows XP, Windows File Protection prevents the replacement of protected system files such as SYS, DLL, OCX, TTF, FON,
and EXE files. Windows File Protection runs in the background and protects all files installed by the Windows Setup program.
Windows File Protection detects attempts by other programs to replace or move a protected system file. It also checks the file's
digital signature.
* This is an operating system feature that allows executable routines (generally serving a specific function or set of functions) to be stored separately as files with DLL
extensions. These routines are loaded only when needed by the program that calls them.
File Signature verification
When you install a new application on your computer, you might overwrite system files and device driver files with unsigned or
incompatible versions, which might provoke system instability.
The system files and device driver files provided with Windows XP have a Microsoft digital signature, which indicates that the files
are original, unaltered system files or that they have been approved by Microsoft for use with Windows.