diff --git a/src/PIL/PsdImagePlugin.py b/src/PIL/PsdImagePlugin.py
index f019bb64e..80bc116fc 100644
--- a/src/PIL/PsdImagePlugin.py
+++ b/src/PIL/PsdImagePlugin.py
@@ -307,3 +307,5 @@ def _maketile(file, mode, bbox, channels):
 Image.register_open(PsdImageFile.format, PsdImageFile, _accept)
 
 Image.register_extension(PsdImageFile.format, ".psd")
+
+Image.register_mime(PsdImageFile.format, "image/vnd.adobe.photoshop")

PSD Plugin does not register a MIME type
The [`PSDImagePlugin`](https://github.com/python-pillow/Pillow/blob/master/src/PIL/PsdImagePlugin.py) does not register a MIME type as I'd expect it to. The correct MIME for PSD images, according to IANA, is ["image/vnd.adobe.photoshop"](https://www.iana.org/assignments/media-types/image/vnd.adobe.photoshop).

Is there a reason this isn't registered?
diff --git a/Tests/test_file_psd.py b/Tests/test_file_psd.py
index 011efc977..6b26fe442 100644
--- a/Tests/test_file_psd.py
+++ b/Tests/test_file_psd.py
@@ -12,6 +12,7 @@ def test_sanity():
         assert im.mode == "RGB"
         assert im.size == (128, 128)
         assert im.format == "PSD"
+        assert im.get_format_mimetype() == "image/vnd.adobe.photoshop"
 
         im2 = hopper()
         assert_image_similar(im, im2, 4.8)

pip install -e .[dev]
parse_log_pytest
requirements.txt
apt-get update apt-get install -y gcc libjpeg-dev zlib1g-dev libtiff5-dev libfreetype6-dev liblcms2-dev libwebp-dev tcl8.6-dev tk8.6-dev libharfbuzz-dev libfribidi-dev libxcb1-dev
3.9
requirements.txt
pytest --no-header -rA --tb=line --color=no -p no:cacheprovider -W ignore::DeprecationWarning
alabaster==0.7.16
babel==2.17.0
black==25.1.0
blessed==1.20.0
build==1.2.2.post1
certifi==2025.1.31
charset-normalizer==3.4.1
check-manifest==0.50
click==8.1.8
coverage==7.8.0
docutils==0.21.2
exceptiongroup==1.2.2
idna==3.10
imagesize==1.4.1
importlib_metadata==8.6.1
iniconfig==2.1.0
jarn.viewdoc==2.7
Jinja2==3.1.6
MarkupSafe==3.0.2
mypy-extensions==1.0.0
olefile==0.47
packaging==24.2
pathspec==0.12.1
-e git+https://github.com/python-pillow/Pillow.git@74c8072945d130248347cd99ff7071a5b11ec42e#egg=Pillow
platformdirs==4.3.7
pluggy==1.5.0
pycodestyle==2.13.0
pyflakes==3.3.1
Pygments==2.19.1
pyproject_hooks==1.2.0
pyroma==4.2
pytest==8.3.5
pytest-cov==6.0.0
requests==2.32.3
six==1.17.0
snowballstemmer==2.2.0
Sphinx==7.4.7
sphinx-removed-in==0.2.3
sphinx-rtd-theme==3.0.2
sphinxcontrib-applehelp==2.0.0
sphinxcontrib-devhelp==2.0.0
sphinxcontrib-htmlhelp==2.1.0
sphinxcontrib-jquery==4.1
sphinxcontrib-jsmath==1.0.1
sphinxcontrib-qthelp==2.0.0
sphinxcontrib-serializinghtml==2.0.0
tomli==2.2.1
trove-classifiers==2025.3.19.19
typing_extensions==4.13.0
urllib3==2.3.0
wcwidth==0.2.13
zipp==3.21.0

name: Pillow
channels:
  - defaults
  - https://repo.anaconda.com/pkgs/main
  - https://repo.anaconda.com/pkgs/r
  - conda-forge
dependencies:
  - _libgcc_mutex=0.1=main
  - _openmp_mutex=5.1=1_gnu
  - ca-certificates=2025.2.25=h06a4308_0
  - ld_impl_linux-64=2.40=h12ee557_0
  - libffi=3.4.4=h6a678d5_1
  - libgcc-ng=11.2.0=h1234567_1
  - libgomp=11.2.0=h1234567_1
  - libstdcxx-ng=11.2.0=h1234567_1
  - ncurses=6.4=h6a678d5_0
  - openssl=3.0.16=h5eee18b_0
  - pip=25.0=py39h06a4308_0
  - python=3.9.21=he870216_1
  - readline=8.2=h5eee18b_0
  - setuptools=75.8.0=py39h06a4308_0
  - sqlite=3.45.3=h5eee18b_0
  - tk=8.6.14=h39e8969_0
  - tzdata=2025a=h04d1e81_0
  - wheel=0.45.1=py39h06a4308_0
  - xz=5.6.4=h5eee18b_1
  - zlib=1.2.13=h5eee18b_1
  - pip:
      - alabaster==0.7.16
      - babel==2.17.0
      - black==25.1.0
      - blessed==1.20.0
      - build==1.2.2.post1
      - certifi==2025.1.31
      - charset-normalizer==3.4.1
      - check-manifest==0.50
      - click==8.1.8
      - coverage==7.8.0
      - docutils==0.21.2
      - exceptiongroup==1.2.2
      - idna==3.10
      - imagesize==1.4.1
      - importlib-metadata==8.6.1
      - iniconfig==2.1.0
      - jarn-viewdoc==2.7
      - jinja2==3.1.6
      - markupsafe==3.0.2
      - mypy-extensions==1.0.0
      - olefile==0.47
      - packaging==24.2
      - pathspec==0.12.1
      - platformdirs==4.3.7
      - pluggy==1.5.0
      - pycodestyle==2.13.0
      - pyflakes==3.3.1
      - pygments==2.19.1
      - pyproject-hooks==1.2.0
      - pyroma==4.2
      - pytest==8.3.5
      - pytest-cov==6.0.0
      - requests==2.32.3
      - six==1.17.0
      - snowballstemmer==2.2.0
      - sphinx==7.4.7
      - sphinx-removed-in==0.2.3
      - sphinx-rtd-theme==3.0.2
      - sphinxcontrib-applehelp==2.0.0
      - sphinxcontrib-devhelp==2.0.0
      - sphinxcontrib-htmlhelp==2.1.0
      - sphinxcontrib-jquery==4.1
      - sphinxcontrib-jsmath==1.0.1
      - sphinxcontrib-qthelp==2.0.0
      - sphinxcontrib-serializinghtml==2.0.0
      - tomli==2.2.1
      - trove-classifiers==2025.3.19.19
      - typing-extensions==4.13.0
      - urllib3==2.3.0
      - wcwidth==0.2.13
      - zipp==3.21.0
prefix: /opt/conda/envs/Pillow

Tests/test_file_psd.py::test_sanity
Tests/test_file_psd.py::test_closed_file Tests/test_file_psd.py::test_context_manager
Tests/test_file_psd.py::test_unclosed_file Tests/test_file_psd.py::test_invalid_file Tests/test_file_psd.py::test_n_frames Tests/test_file_psd.py::test_eoferror Tests/test_file_psd.py::test_seek_tell Tests/test_file_psd.py::test_seek_eoferror Tests/test_file_psd.py::test_open_after_exclusive_load Tests/test_file_psd.py::test_icc_profile Tests/test_file_psd.py::test_no_icc_profile Tests/test_file_psd.py::test_combined_larger_than_size
src/PIL/PsdImagePlugin.py
src/PIL/PsdImagePlugin.py