# Review Data Loader Output Files

After an import or export, Data Loader generates two CSV output files that contain the results of the operation. One file name begins with `success`, and the other starts with `error`. Both files have the extension `.csv`. Use the Data Loader CSV file viewer to open the files. Specify the folder containing `success` and `error` CSV files in the `Finish` step of an operation.

## Before You Begin

:::note
Export operations don’t generate a success file by default. To generate a success file when exporting data, check **Generate status files for exports** in the Advanced Settings dialog.
:::

1. Choose **View** | **View CSV**.

2. Specify the number of rows to view. Each row in the CSV file corresponds to one Salesforce record. The default is 1,000.

3. To view a specific CSV file, click **Open CSV**. To view the last success file, click **Open Success**. To view the last error file, click **Open Error**.

4. To open the file in an external program, such as Excel, click **Open in External Program**.

   The success file contains the successfully loaded records, including a column with the newly generated record IDs. The error file contains the rejected records, with a column that describes why the load failed. If the object you’re exporting has a column named “success” or “error”, your output file columns could display incorrect information. To avoid this problem, rename the columns.

5. To return to the CSV Chooser window, click **Close**. To exit the window, click **OK**. To generate success files when exporting data, select `Generate status files for exports`.