Before you can import items into the repository, their MIME types must be defined in EPM Workspace. Although EPM Workspace has many built-in MIME types, you may need to define others.
You can associate a MIME type with multiple file extensions. For example, you can associate the extensions .txt, .bat, and .dat with the text MIME type.
Multiple MIME types can use one extension. For example, if your organization uses multiple versions of a program, you can define a MIME type for each version; however, file names of all versions use the same extension. When users opens files with extensions that belong to multiple MIME types, they are prompted to select a program executable.
In the MIME type list, traffic-light icons indicate active (green) or inactive (red); see Inactivating or Reactivating MIME Types.