| OpenOffice.org OpenDocument Format | |
| Microsoft | |
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ODC is a text document file that stores data using HTML and XML formats. ODC file format is used by Microsoft Excel spreadsheet application since the release of Excel 2007.
ODC files store authentication settings for external database connections performed in order to refresh spreadsheet/workbook data. ODC files must be compatible with either OLE DB or ODBC API for remote database access.
Mac OS
| .a2theme | Aston 2 Theme Format |
| .acb | Adobe Color Book Format |
| .acbl | Adobe Color Book Format |
| .aco | Adobe Photoshop Color Palette And Swatches Format |
| .acrobatsecuritysettings | Adobe Acrobat Security Settings Format |
| .acrodata | Adobe Acrobat Data Format |
| .acv | Adobe Photoshop Colour Curves Format |
| .acw | Microsoft Accessibility Wizard Format |
