Table: dbo.Known_Application_Extension
This table contains the known application extensions (i.e. excel has xls and xlsx, word as doc and docx, etc...).
Columns
Name | Type | Constraints | Description
known_application_extension_KEY | int (4) | NOT NULL | Primary key. This points to the application extension.
known_application_type_KEY | int (4) | NOT NULL | Foreign key to the Known_Application_Type table. This points to the application for this extension.
description | nvarchar (512) | NOT NULL | The lowercase extension (without the period) of the application

Primary key
Name | Columns | Description
PK_Known_Application_Extension | known_application_extension_KEY |
Unique constraints
Name | Columns | Description
UK_Known_Application_Extension$description | description |

Foreign keys
Name | Columns | Referenced table | Description
FK_Known_Application_Extension__Known_Application_Type__known_application_type_KEY | known_application_type_KEY | Known_Application_Type (known_application_type_KEY) |