- Extended Type 3000
  - Similar to a "Standard" Type 3000 file, except that it is not limited to 26 subrecords.
- Extended Type 5000
  - Similar to a "Standard" Type 5000 file, except that it is not limited to 14 subrecords.
- Support for Extended Type 3000/5000
  - Increasing the number of subrecords is done by extending the size of the adjunct header beyond 256 bytes.
    - A field in the main header specifies the data start position, so this does not cause problems with reading the data in the file.
  - Extended Type 3000/5000 files are not part of version 1.0 of the BLUE file specification and are only supported by NeXtMidas.
  - There is ongoing discussion about including Extended Type 3000 files in version 1.1 of BLUE file specification since this would allow users to create Type 3000 files with 26+ subrecords without the need to use a Type 6000 file.