.WSP File Extension
SharePoint Solution Package
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What is a WSP file?
Package used by SharePoint, an enterprise-level document and content management system; saves a Windows SharePoint Services solution, which is a custom component, such as a website, that can be added to a company's SharePoint site.
WSP files are compressed in a .CAB format and can be created using the Makecab.exe program. The archive can include various site resources and source code files. The WSP file can be added to a SharePoint configuration database using the stsadm -o addsolution file.wsp command. It can be deployed to SharePoint servers using the stsadm -o deploysolution file.wsp command.
WSP files can be developed using Microsoft Visual Studio with the with the "Visual Studio extensions for Windows SharePoint Services" plug-in.