.RDLC File Extension
Visual Studio Client Report Definition File
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What is an RDLC file?
Report definition file created by Microsoft Visual Studio, an application that allows developers to create Windows programs; contains layout settings, text fields, graphics, and other information for the report; stored using XML formatting.
RDLC files are used for generating reports within a client application running Visual Studio's ReportViewer control in local processing mode (in contrast to remote processing mode).