Known SY_ Files

Primary SY_ File Association

.SY_

File ID:	.sy_
Class:	Compressed SYS File

Compressed .SYS file sometimes used by application installers to reduce the size of installation files.

Developer:	Microsoft Corporation
File Category:	Compressed Files
Entry:	HKEY_CLASSES_ROOT\.sy_

Software Programs That Open The Compressed SYS File:

Microsoft Expand by Microsoft Corporation

Windows

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Troubleshooting Problems Opening SY_ Files

Frequent SY_ Opening Issues

Microsoft Expand Disappeared

You attempt to load your SY_ file and get an error such as "%%os%% Can't Open The SY_ File Extension". Customarily, this means that Microsoft Expand is not installed on %%os%%. You won't be able to double-click to open your SY_ because your OS doesn't know what to do with it.

Tip: If you don't have Microsoft Expand installed, and you know of another program to open your SY_ file, you can try opening it by selecting from the programs listed under "Show Apps".

Microsoft Expand is Out-of-Date

In some cases, you might have a newer (or older) version of a Compressed SYS File file that is unsupported by your installed application version. If you've got the wrong version of Microsoft Expand installed, you'll need to install the correct version. Your Compressed SYS File file was probably created by a newer release of Microsoft Expand than what's currently installed your computer.

Tip: Investigate your SY_ file by right-clicking and selecting "Properties" to find clues on what version you need.

Regardless, most of the SY_ file opening problems relate to not having the right version of Microsoft Expand installed.

Other Causes of SY_ File Opening Problems

Assuming you have the right Microsoft Expand version installed, other problems can prevent you from opening SY_ files. If you are still having problems opening SY_ files, there may be other issues that are preventing you from opening these files. Additional factors include:

• SY_ file references in the Windows Registry are broken
• Corruption of the SY_ file description inside the Registry
• Microsoft Expand or another SY_ application experienced a flawed installation
• File corruption affecting your SY_ file
• The SY_ is infected with a virus
• Device drivers of the hardware associated with your SY_ file are corrupt or out-of-date
• Insufficient system resources to successfully open Compressed SYS File files