The extensions of executable files in Windows are

.exe, .sys, .com, .bat and other types of files.

1, EXEFile executable program a kind of executable program can be located in the operating system storage space floating. MS-DOS and MS-WINDOWS, this kind of file extension .exe. WINDOWS operating system in the binary executable file, executable file is divided into two kinds of one is the suffix named -COM another is the .EXE.

2, .sys is the abbreviation of system, is the meaning of the system, sys is the Windows system files. Such as installation files, log files, driver files, backup files, operations such as playback and other files, but also some garbage files and so on and so forth. Are such sys suffix.

3, .COM is generally used for DOS, WINDOWS system in the implementation of the file are generally -EXE file in MS-DOS, to identify the file extension of the executable file. The user can run the executable program by typing the filename without the .exe extension at the prompt line and pressing Enter.

Extension:

Some software can be used to back up the system, or optimization software, system management software, which can look at unidentified system processes and disable and remove them, and clean up system junk.

Protecting your system from malicious software and programs. If you find any unidentified files or processes, you can remove or uninstall them in a timely manner.

The header contains information that MS-DOS uses to load programs, such as the size of the program and the initial value of registers. The header also points to a relocation table, which contains a chain of pointers to the addresses of relocatable segments in the program image.

MS-DOS loads the exe program by copying the image directly from the file into memory, and then adjusts the relocatable segment addresses stated in the relocation table. The locate table is an array of relocation pointers, each pointing to a relocatable segment address in the program image.

References:

Baidu Encyclopedia-sys

Baidu Encyclopedia-.exe