Hi @mark goldin ,
By default Report Builder cannot open .rdlc files, it supports .rdl files. You could simply convert .rdlc files to .rdl manually:
A report with extension ".rdl" is a server report, and the a report with extension ".rdlc" is a local report. A server report need to be published to a Report Server, and the local report is used for the ReportViewer control that is running in local mode.
For more information,please refer to: Converting RDLC Files to RDL Files.
Best Regards,
Joy
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