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File Format Specification Index



Basic Description

The SYS format is basically a subset of the BMP format , where only certain combinations are allowed. There are a few weird aspects to this format.
Important note:
This is the format of the LOGO.SYS, LOGOW.SYS and LOGOS.SYS files of Windows 95.
It does not apply to any other file!
Other files may be binary code (KEYB.SYS) or ASCII (CONFIG.SYS) or actually anything else.

Basic File Format

Infoheader.Width = 320
Infoheader.Height = 400 (watch the AspectRatio!!!)
Infoheader.BitCount = 8
Infoheader.ColorsImportant thru 255 are cycled.

Raster Data encoding

Look at the 8bit - no compression section for BMPs .


Portability, what portability? This is a special case of BMP for Windows95. There's nothing more to say.

Trademarks, Patents and Royalties

To my knowledge: none.
(please read the disclaimer)

Cross-Checking Software

This section is for programmers, who wish to cross-check their implementation with others. This is an incomplete list of programs, which are available as freeware / shareware / try-before-buy etc.
The following software is able to decode SYSs:
  • use Windows 95. (unfortunately not freeware)
The following software is able to encode SYSs

Online Resources


Paper Resources



This is not the official format documentation. Although we're doing our best to keep this information as accurate as possible, there is no way of checking all of it under all possible circumstances. We're not taking any responsibility for the results of these information or lack thereof. The 'trademarks, patents and royalties' section is here just for your convenience, and is in no way complete. Please send us a note, if you find any incorrect of missing information.