You can do it twice, because some objects can be flattened only the second time. Select all, then call the Flatten command.We also advice to use the PURGE command (works in the command line, without dialog) and use its different options, especially ANnotscales and sorTTable Use the Purge command to clear waste objects.You can also use the XPROXY command to explode visible proxy-entities. Call the RMPROXY command - Nongraphicalproxies to remove proxy objects which do not have a graphic.Unfreeze, unlock and turn on all layers.Run nanoCAD 23, then call the RECOVER command to open the file.If your file is version 2013 or earlier and you still encounter issues, attempt to recover the file by using nanoCAD Platform: The code 'AC1032' indicates that the file is in the DWG 2018 format. To work with DWG files of this format, upgrade to the nanoCAD Platform.At the beginning of the file, you will find a code in the format: AC10XX, where 'XX' varies and could be 32, 27, 24, 21, etc.
Please verify the version of your DWG file by following these steps: NanoCAD Free supports DWG file versions up to 2013 only.