Common file types extensions location and purpose summaries in ES0en.NET

.asax

The application root directory.
It is usually the Global.asax file, which contains the code derived from the HttpApplication class and representing the application.
For more information, see the ES9en.asax syntax.

.ascx

The application root or subdirectory.
Web user control file, which defines custom, reusable user controls.
For more information, see ASP. NET User Controls.

.ashx

The application root or subdirectory.
A generic handler file containing the code that implements the IHttpHandler interface to handle all incoming requests.
For more information, see the HTTP handler introduction.

.asmx

The application root or subdirectory.
XML Web services file, which contains the classes and methods available to other Web applications via SOAP.
For more information, see Publishing and deployment of XML Web Services.

.aspx

The application root or subdirectory.
ASP.NET Web forms file, which can contain Web controls and other business logic.
For more information, see the ASP.NET page and ASP.NET Web Server Controls.

.axd

The application root directory.
Trace viewer files, usually Trace.axd.
For more information, see ES69en.ES70en tracking.

.browser

App_Browsers subdirectory.
A browser definition file that identifies the enabling functionality of the client browser.
For more information, see ASP.NET Web Server Controls and Browser features.

.cd

The application root or subdirectory.
Class diagram file.
For more information, see Working with class diagrams.

.compile

Bin subdirectory.
A precompiled stub (stub) file that points to the corresponding assembly. The executable file types (.aspx, ascx,.master, subject files) are precompiled and placed under the Bin subdirectory.
For more information, see the ASP.NET website precompilation overview.

.config

The application root or subdirectory.
It is usually an ES111en. config configuration file, which contains XML elements whose Settings configure various ES113en. NET functions.
For more information, see the ES117en.NET configuration file.

.ES121en,.jsl,.vb

App_Code subdirectory; But if it's a code hiding file on the ASP.NET page, it's in the same directory as the web page.
The class source file to compile at runtime. The class can be the HTTP module, HTTP handler, or the code hiding file described by ASP.NET page HTTP handler.

.csproj,.vbproj, vjsproj

Visual Studio project directory.
Visual Studio client application project project file.
For more information, see Projects and Solutions.

disco, vsdisco

App_WebReferences subdirectory.
XML Web services discovery file to help locate the available Web services.
For more information, see XML Web Service Release and Deployment.

dsdgm, dsprototype

The application root or subdirectory.
A distributed service diagram (DSD) file that can be added to any Visual Studio solution that provides or uses Web services to reverse engineer the structural view of Web service interaction.
For more information, see XML Web Service Release and Deployment.

.dll

Bin subdirectory.
The compiled class library file. Alternatively, you can place the source code for the class under the App_Code subdirectory.
For more information, see the Shared Code folder on the ES194en.NET website.

licx, webinfo

The application root or subdirectory.
License file. Control creators can help protect their intellectual property by using authorization methods to check whether users are authorized to use the control.
For more information, see How to: License Components and Controls.

.master

The application root or subdirectory.
Master page, which defines the layout of other pages in the application that reference the master page.
For more information, see the ASP.NET master page.

mdb, ldb

App_Data subdirectory.
Access database file.
For more information, see accessing data through ES225en.NET.

.mdf

App_Data subdirectory.
SQL database file.
For more information, see Accessing data through ES237en.NET.

msgx, svc

The application root or subdirectory.
Indigo Messaging Framework (MFx) service file.

.rem

The application root or subdirectory.
Remote handler file.
For more information, see Modifying SOAP messages with the SOAP extension.

.resources

App_GlobalResources or App_LocalResources subdirectory.
A resource file that contains a resource string pointing to an image, localizable text, or other data.
For more information, see Resources in the Application or How to: Create a resource file for the ES272en.NET website.

.resx

App_GlobalResources or App_LocalResources subdirectory.
A resource file that contains a resource string pointing to an image, localizable text, or other data.
For more information, see Resources in the Application or How to: Create a resource file for the ES285en.NET website.

sdm, sdmDocument

The application root or subdirectory.
System Definition Model (SDM) file.
For more information, see the Overview of the System Definition Model (SDM).

.sitemap

The application root directory.
A sitemap file that contains the structure of the site. ASP. NET comes with a default sitemap provider that makes it easy to display navigation controls on web pages using sitemap files.
For more information, see the ES306en.NET site navigation.

.skin

App_Themes subdirectory.
The appearance file used to determine the display format.
For more information, see ES317en.NET theme and look-and-feel.

.sln

Visual Web Developer project directory.
Visual Web Developer project solution file.
For more information, see Projects and Solutions.

.soap

The application root or subdirectory.
SOAP extension file.
For more information, see Modifying SOAP messages with the SOAP extension.