Sorts of MASTER Files

Dominant MASTER File Type

.MASTER

File Ext:	.master
File Type:	ASP.NET Master Page

MASTER file is a master Web page or template created with ASP.NET. It used for building multiple pages with the same layout. It constructed using HTML like a typical Web page.

Created by:	Microsoft Corporation
File Category:	Web Files
Location:	HKEY_CLASSES_ROOT\.master

Software Programs That Open The ASP.NET Master Page:

Microsoft Visual Studio by Microsoft Corporation

Windows

WebMatrix by Microsoft Corporation

Windows

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Troubleshooting Problems Opening MASTER Files

Common Problems Opening MASTER Files

Microsoft Visual Studio Not Present

When you double-click your MASTER file, you may see a dialog box from your operating system stating that it "Cannot Open This File Type". If so, it typically means that you don't have Microsoft Visual Studio installed for %%os%%. Because your operating system doesn't know what to do with this file, you won't be able to open it by double-clicking.

Tip: If you know of another program that can open your MASTER file, you can try opening it by selecting the application from the programs listed.

Microsoft Visual Studio is Out-of-Date

Your ASP.NET Master Page file is incompatible with Microsoft Visual Studio because you might have the wrong version installed. If you do not have the proper version Microsoft Visual Studio (or any of the other programs listed above), you may need to try downloading a different version of it, or one of the other software applications listed above. Most of the time your ASP.NET Master Page file was created by a newer Microsoft Visual Studio than what you have installed.

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

Ultimately, most of the difficulties opening MASTER files are due to having the wrong version of Microsoft Visual Studio installed.

Additional MASTER Opening Issues

Errors opening ASP.NET Master Page files can still occur even with the latest Microsoft Visual Studio software installed on your computer. There can be other issues - unrelated to software - preventing you from opening MASTER files. Problems unrelated to software:

• MASTER file type Registry entries are wrong
• Deletion of the MASTER file description from the Registry by mistake
• Microsoft Visual Studio or another MASTER application experienced a flawed installation
• Your MASTER can't be loaded properly (file corruption)
• Malware-tainted MASTER file can't be opened
• Device drivers for MASTER-related hardware are out-of-date
• Windows cannot load your ASP.NET Master Page file due to insufficient resources (eg. RAM)