| att_content_type_code | description                                                                                                | file_extension | active_date | inactive_date |
|-----------------------|------------------------------------------------------------------------------------------------------------|----------------|-------------|---------------|
| 1                     | Adobe Portable Document Format (Acrobat 4.x or higher)                                                     | .PDF           | 4/11/2008   | 12/31/9999    |
| 2                     | Advantica SynerGEE compatible Microsoft Access application MDB file                                        | .MDB           | 4/11/2008   | 12/31/9999    |
| 3                     | Advantica SynerGEE input data set for pipe flow program                                                    | .PD            | 4/11/2008   | 12/31/9999    |
| 4                     | Advantica SynerGEE xy coordinate text file                                                                 | .XY            | 4/11/2008   | 12/31/9999    |
| 5                     | ASCII Comma Separated Value                                                                                | .CSV           | 4/11/2008   | 12/31/9999    |
| 6                     | ASCII Text Format                                                                                          | .TXT           | 4/11/2008   | 12/31/9999    |
| 7                     | AutoCAD Drawing database                                                                                   | .DWG           | 4/11/2008   | 12/31/9999    |
| 8                     | Corel WordPerfect                                                                                          | .WPD           | 4/11/2008   | 12/31/9999    |
| 9                     | ESRI Shape Format (vector format created by the Environmental System Research Institute) main file         | .SHP           | 4/11/2008   | 12/31/9999    |
| 10                    | ESRI Shape Format (vector format created by the Environmental System Research Institute) index file        | .SHX           | 4/11/2008   | 12/31/9999    |
| 11                    | ESRI Shape Format (vector format created by the Environmental System Research Institute) dBase table       | .DBF           | 4/11/2008   | 12/31/9999    |
| 12                    | ESRI Shape Format (vector format created by the Environmental System Research Institute) projection file   | .PRJ           | 4/11/2008   | 12/31/9999    |
| 13                    | ESRI ArcGIS auxiliary file                                                                                 | .AUX           | 4/11/2008   | 12/31/9999    |
| 14                    | ESRI ArcGIS external pyramid layer file used for rapid display of raster files                             | .RRD           | 4/11/2008   | 12/31/9999    |
| 15                    | ESRI ArcMap project file                                                                                   | .MXD           | 4/11/2008   | 12/31/9999    |
| 16                    | ESRI ArcIMS Project file (ArcXML)                                                                          | .AXL           | 4/11/2008   | 12/31/9999    |
| 17                    | ESRI ArcView spatial bin file for shapefiles                                                               | .SBN           | 4/11/2008   | 12/31/9999    |
| 18                    | ESRI ArcView spatial bin index file for shapefiles                                                         | .SBX           | 4/11/2008   | 12/31/9999    |
| 19                    | ESRI TIFF world files 1                                                                                    | .TFW           | 4/11/2008   | 12/31/9999    |
| 20                    | ESRI ArcGIS MrSid (LizardTech) image raster file                                                           | .SID           | 4/11/2008   | 12/31/9999    |
| 21                    | ESRI ArcGIS MrSid georeferencing information (world) file                                                  | .SDW           | 4/11/2008   | 12/31/9999    |
| 22                    | Extensible Markup Language                                                                                 | .XML           | 4/11/2008   | 12/31/9999    |
| 23                    | FERC Index of Customers and Form No. 11 information collection tab delimited text files 2                  | .TAB           | 4/11/2008   | 12/31/9999    |
| 24                    | Graphic Image Format                                                                                       | .GIF           | 4/11/2008   | 12/31/9999    |
| 25                    | Gregg Engineering WinFlow output file                                                                      | .LOG           | 4/11/2008   | 12/31/9999    |
| 26                    | Gregg Engineering WinFlow output file                                                                      | .NTP           | 4/11/2008   | 12/31/9999    |
| 27                    | Gregg Engineering WinFlow output file                                                                      | .OVR           | 4/11/2008   | 12/31/9999    |
| 28                    | Gregg Engineering WinFlow input file                                                                       | .WFP           | 4/11/2008   | 12/31/9999    |
| 29                    | Gregg Engineering WinTran time-varying schedule file                                                       | .SCH           | 4/11/2008   | 12/31/9999    |
| 30                    | Gregg Engineering WinTran output file                                                                      | .WTO           | 4/11/2008   | 12/31/9999    |
| 31                    | Gregg Engineering WinTran output file                                                                      | .WTS           | 4/11/2008   | 12/31/9999    |
| 32                    | Joint Photographic Experts Group                                                                           | .JPG           | 4/11/2008   | 12/31/9999    |
| 33                    | Keyhole Markup Language (xml-based structure for geographic data in an Earth browser such as Google Earth) | .KML           | 4/11/2008   | 12/31/9999    |
| 34                    | Keyhole Markup Language compressed file                                                                    | .KMZ           | 4/11/2008   | 12/31/9999    |
| 35                    | Lotus                                                                                                      | .WK1           | 4/11/2008   | 12/31/9999    |
| 36                    | Microsoft Excel 4                                                                                          | .XLS           | 4/11/2008   | 12/31/9999    |
| 37                    | Microsoft Media Player                                                                                     | .WVA           | 4/11/2008   | 12/31/9999    |
| 38                    | Microsoft Power Point                                                                                      | .PPT           | 4/11/2008   | 12/31/9999    |
| 39                    | Microsoft Word                                                                                             | .DOC           | 4/11/2008   | 12/31/9999    |
| 40                    | Motion Picture Experts Group 3                                                                             | .MPG           | 4/11/2008   | 12/31/9999    |
| 41                    | MP3 audio file (mp3) 3                                                                                     | .MP3           | 4/11/2008   | 12/31/9999    |
| 42                    | Managing and Utilizing System Transmission (MUST) Software 1                                               | .CON           | 4/11/2008   | 12/31/9999    |
| 43                    | RAW Image File (RGB 24-bit Graphics)                                                                       | .RAW           | 4/11/2008   | 12/31/9999    |
| 44                    | Rich Text Format                                                                                           | .RTF           | 4/11/2008   | 12/31/9999    |
| 45                    | Tagged Image File Format                                                                                   | .TIF           | 4/11/2008   | 12/31/9999    |
| 46                    | Waveform sound (Microsoft Windows) 3                                                                       | .WAV           | 4/11/2008   | 12/31/9999    |
| 47                    | Web page file containing Hypertext Markup Language (HTML) markup                                           | .HTM           | 4/11/2008   | 12/31/9999    |
| 48                    | Windows bitmap                                                                                             | .BMP           | 4/11/2008   | 12/31/9999    |
| 49                    | Zip file compressed archive (must not be self-extracting)                                                  | .ZIP           | 4/11/2008   | 12/31/9999    |
| 50                    | Microsoft Excel 2007                                                                                       | .XLSX          | 7/11/2011   | 12/31/9999    |
| 51                    | Microsoft Power Point 2007                                                                                 | .PPTX          | 7/11/2011   | 12/31/9999    |
| 52                    | Microsoft Word 2007                                                                                        | .DOCX          | 7/11/2011   | 12/31/9999    |