Extract text from SY_ files
To convert your SY_ file to another format, you need Microsoft Windows or other Compressed software.
To convert other file formats to the "Compressed System File" file type, you need software like Microsoft Windows or a similar tool.
A .sy_ file is a compressed version of a Windows System file, typically a driver (.SYS), stored on Microsoft Windows installation media or update packages. Microsoft uses this convention - replacing the final character of the file extension with an underscore - to indicate that the file is packed using Microsoft Compress (LZ77) or Cabinet (CAB) compression algorithms to save disk space.
The frustrating part for users is that .sy_ files are not directly executable or usable by the operating system. You cannot simply rename a .sy_ file to sys and expect it to work; the internal binary structure is fundamentally different due to compression. This file format is often encountered when attempting to manually extract a specific driver from a Windows installation CD to repair a corrupted system, or when dealing with legacy hardware drivers. To make the file functional, it must be "expanded" or decompressed.
For system recovery or driver installation, the goal is to convert (decompress) the .sy_ file back to its original SYS format. While the command-line utility expand.exe included with Windows can handle this, it requires familiarity with command prompt syntax (e.g., expand filename.sy_ filename.sys). Modern archive tools like 7-Zip can sometimes treat these as archives, but results vary depending on the specific compression algorithm used (SZDD vs KWAJ). Converting online is often the fastest way to retrieve the usable driver without navigating legacy DOS commands.
Convert.Guru analyzes your SY_ file, detects the exact format, and lets you read the text inside.
Users also converted DAT, TXT and HTML files.
If you want to convert SY_ file to ZIP, RAR, 7Z, TAR, GZ, BZ2, XZ, LZMA, CAB, ACE, ARJ or LHA, you can use Microsoft Windows or similar software from the "Compressed Windows Driver" category. In the File menu, look for Save As… or Export….
To convert XXE, 7Z, Z, PAK, LHA, DEB, UUE, TAR, LZH, ZIP, PKG or RAR files to SY_, try Microsoft Windows or another comparable tool in the "Compressed Windows Driver" category.
The history of Convert.Guru began over 25 years ago in California with Tom Simondi’s file-format database. A former contributor to Space Shuttle development and a software pioneer of the 1980s, Simondi established a trusted resource for file type analysis that was even referenced by Microsoft Windows XP. Today, we use modern technology to process and convert thousands of file formats while continually improving our SY_ converter.