The selectFileList method of the RadFileExplorer's FileList client-object accepts an array of string providing the names of the files to be selected. Please note that first you need to navigate to the folder containing these files, you can do that either using InitialPath property or calling loadFolder(path) client-side method of RadFileExplorer.
More detailed information regarding RadFileExplorer's client-side and server-side members is available in our online documentation.
Regards,
Dobromir
Telerik
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