.SY_ File Extension

Compressed SYS File

Developer Microsoft
4.3  |  8 Votes

What is an SY_ file?

Compressed .SYS file sometimes used by application installers to reduce the size of installation files; similar to a .EX_ or .DL_ file and can be expanded back to a SYS file using the Microsoft Expand command line utility with the following syntax:

More Information

expand file.sy_ file.sys

NOTE: SY_ files also may just be renamed SYS files and therefore may not be compressed.

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Programs that open SY_ files

Included with OS

Verified by FileInfo.com

The FileInfo.com team has independently researched the Compressed SYS file format and Windows apps listed on this page. Our goal is 100% accuracy and we only publish information about file types that we have verified.

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