W40 Types

Primary W40 File Association

.W40

File Ext:	.w40
Classification:	Windows 95 Backup File

W40 file is a system backup file for Microsoft Windows operating system. Windows 95 Setup creates W40 files based on the existing config.sys, autoexec.bat file.

Developer:	Microsoft Corporation
Kind:	Backup Files
Key:	HKEY_CLASSES_ROOT\.w40

Software Programs That Open The Windows 95 Backup File:

Microsoft Windows by Microsoft Corporation

Windows

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Sources of W40 Problems

Common Problems Opening W40 Files

Microsoft Windows Isn't There

You encounter an error message such as "%%os%% Can't Open W40 Files" when trying to open your W40. When this happens, it is commonly due to Microsoft Windows missing in %%os%%. Your operating system cannot associate your W40 with Microsoft Windows, so double-clicking the file won't work.

Tip: If you have another software that you know opens W40 files, you can select it by hitting the "Show Apps" button.

Incorrect Microsoft Windows Version

It is possible that your version of Microsoft Windows isn't able to open your Windows 95 Backup File file due to incompatibility. Download the latest Microsoft Windows version from the Microsoft Corporation website to ensure you have the correct one installed. This problem is most common when you have an older version of the software application, and your file was created by a newer version that it cannot recognize.

Tip: Right-clicking on your W40, then clicking "Properties" (Windows) or "Get Info" (Mac), can provide clues about your file version.

Summary: In either case, the majority of problems opening W40 files are related to not having the correct software application installed on your computer.

Other W40 File Issues

Even with the correct version of Microsoft Windows installed, you can still experience difficulties opening W40s. There can be other issues - unrelated to software - preventing you from opening W40 files. Additional factors include:

• W40 file references in the Windows Registry are broken
• Deletion of the W40 file description from the Registry by mistake
• Defective install of a W40 program, such as Microsoft Windows
• W40 file corruption
• Past or present virus infection has affected your W40
• Hardware related to W40s has device driver corruption
• Insufficient system resources to successfully open Windows 95 Backup File files