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"Invalid Cell Library", "format version not supported", or "is not a recognized file format" message appears in a pop up or in the status bar when trying to attach a cell or reference file or otherwise incorporate non-native drawing files.
These types of messages indicate that the source material being attached, inserted, or imported is not compatible with the platform.
Often, saving the source file in the format of an older or newer version using the application that created the file will make the file compatible.
Keywords: .DWG, .SKPP/S: 62424, 500000082546