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They are system files that contain device drivers or hardware configurations for the system. Most DOS .sys files are real mode device drivers. [1] Certain files using this extension are not, however: MSDOS.SYS and IO.SYS are core operating system files in MS-DOS and Windows 9x. CONFIG.SYS is a text file that contains various configuration ...
(Although the system attribute can be manually put on any arbitrary file; these files do not become system files.) Specific example of system files include the files with .sys filename extension in MS-DOS. In Windows NT family, the system files are mainly under the folder C:\Windows\System32. In Mac OS they are in the System suitcase. And in ...
A utility to make a volume bootable. Sys rewrites the Volume Boot Code (the first sector of the partition that SYS is acting on) so that the code, when executed, will look for IO.SYS. SYS also copies the core DOS system files, IO.SYS, MSDOS.SYS, and COMMAND.COM, to the volume. SYS does not rewrite the Master Boot Record, contrary to widely held ...
MS-DOS / PC DOS and some related disk operating systems use the files mentioned here. System Files: [1] IO.SYS (or IBMBIO.COM): This contains the system initialization code and builtin device drivers; MSDOS.SYS (or IBMDOS.COM): This contains the DOS kernel. Command-line interpreter (Shell): COMMAND.COM: This is the command interpreter.
As the files are standard RLE-compressed .BMPs (with an entirely optional custom tag segment) renamed to .SYS, they may be opened and edited using image editing tools such as MS Paint, and the contents replaced with user-selected pictures; the only conversion needed is to change the file extension, and to ensure they are in the correct ...
C4 – JEDMICS image files, a DOD system; CALS – JEDMICS image files, a DOD system; XAML – Used in programs like Visual Studio to create exe files. CPT, SEA – Compact Pro ; CS – File extension for C-Sharp (C#) files; DAA – DAA: Closed-format, Windows-only compressed disk image; DEB – Debian install package
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CONFIG.SYS is the primary configuration file for the DOS and OS/2 operating systems.It is a special ASCII text file that contains user-accessible setup or configuration directives evaluated by the operating system's DOS BIOS (typically residing in IBMBIO.COM or IO.SYS) during boot.