Regsvcs.exe (.NET Services Installation Tool) - .NET Framework
By gewarren
Archived: 2026-04-05 14:34:28 UTC
The .NET Services Installation tool performs the following actions:
Loads and registers an assembly.
Generates, registers, and installs a type library into a specified COM+ application.
Configures services that you have added programmatically to your class.
To run the tool, use Visual Studio Developer Command Prompt or Visual Studio Developer PowerShell.
At the command prompt, type the following:
Syntax
 regsvcs [/c | /fc | /u] [/tlb:typeLibraryFile] [/extlb]
[/reconfig] [/componly] [/appname:applicationName]
[/nologo] [/quiet]assemblyFile.dll
Parameters
Option Description
/appdir: path Specifies the root directory of the application.
/appname: applicationName Specifies the name of the COM+ application to either find or create.
/c Creates the target application.
/componly Configures components only; ignores methods and interfaces.
/exapp Specifies to the tool to expect an existing application.
/extlb Uses an existing type library.
/fc Finds or creates the target application.
/help Displays command syntax and options for the tool.
/noreconfig Does not reconfigure an existing target application.
/nologo Suppresses the Microsoft startup banner display.
https://msdn.microsoft.com/en-us/library/04za0hca.aspx
Page 1 of 3

Option Description
/parname: name Specifies the name or id of the COM+ application to either find or create.
/reconfig Reconfigures an existing target application. This is the default.
/tlb: typelibraryfile Specifies the type library file to install.
/u Uninstalls the target application.
/quiet Specifies quiet mode; suppresses the logo and success message display.
/? Displays command syntax and options for the tool.
Regsvcs.exe requires a source assembly file specified by assemblyFile.dll. This assembly must be signed with a
strong name. For more information on strong name signing, see Signing an Assembly with a Strong Name. The
names of the target application and the type library file are optional. The applicationName argument can be
generated from the source assembly file and will be created by Regsvcs.exe, if it does not already exist. The
typelibraryfile argument can specify a type library name. If you do not specify a type library name, Regsvcs.exe
uses the assembly name as the default.
When Regsvcs.exe registers a component's methods, it is subject to the demands and link demands on those
methods. Because the tool executes in a fully-trusted environment, most demands for a permission succeed.
However, Regsvcs.exe cannot register components with methods protected by a demand or link demand for the
StrongNameIdentityPermission or the PublisherIdentityPermission.
You must have administrative privileges on the local computer to use Regsvcs.exe.
If Regsvcs.exe fails while performing any of these actions, it displays corresponding error messages.
Examples
The following command adds all public classes contained in myTest.dll to myTargetApp (an existing COM+
application) and produces the myTest.tlb type library.
regsvcs /appname:myTargetApp myTest.dll
The following command adds all public classes contained in myTest.dll to myTargetApp (an existing COM+
application) and produces the newTest.tlb type library.
regsvcs /appname:myTargetApp /tlb:newTest.tlb myTest.dll
See also
Tools
How to: Sign an Assembly with a Strong Name
https://msdn.microsoft.com/en-us/library/04za0hca.aspx
Page 2 of 3

Developer command-line shells
Source: https://msdn.microsoft.com/en-us/library/04za0hca.aspx
https://msdn.microsoft.com/en-us/library/04za0hca.aspx
Page 3 of 3