product name ignored by `flet build` on windows

[asmaier]

Duplicate Check

• I have searched the opened issues and there are no duplicates

Describe the bug

When building an app on windows, the name of the .exe file generated is not the name configured in pyproject.toml under

[tool.flet]
# project display name that is used as an app title on Android and iOS home screens,
# shown in window titles and about app dialogs on desktop.
product = "my-product"

Code sample

Code

[Paste your code here]

To reproduce

uv init flet_test --bare
cd flet_test
uv add flet[all] --dev
uv run flet create

Then edit pyproject.toml and change to

[tool.flet]
product = "my-product"

Finally run

uv run flet build windows

This will create .\build\windows\flet_test.exe instead of the expected .\build\windows\my-product.exe

Expected behavior

I expect flet build to use the variable tool.flet.product from pyproject.toml to name the generated executable file also on Windows. On Mac this actually works and

uv run flet build macos

will generate build/macos/my-product.app as expected.

Screenshots / Videos

Captures

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Operating System

Windows

Operating system details

Windows 11 Pro 64Bit Arm

Flet version

0.27.5

Regression

No, it isn't

Suggestions

No response

Logs

Logs

[Paste your logs here]

Additional details

No response

[ndonkoHenri]

What do you see in build/flutter/windows/runner/Runner.rc?

[asmaier]

I see the following

BEGIN
  VALUE "CompanyName", "Flet" "\0"
  VALUE "FileDescription", "my-product" "\0"
  VALUE "FileVersion", VERSION_AS_STRING "\0"
  VALUE "InternalName", "flet_test" "\0"
  VALUE "LegalCopyright", "Copyright (C) 2025 by Flet" "\0"
  VALUE "OriginalFilename", "flet_test.exe" "\0"
  VALUE "ProductName", "my-product" "\0"
  VALUE "ProductVersion", VERSION_AS_STRING "\0"
END

[ndonkoHenri]

• project: project name for executable or bundle
• product: project display name that is shown in window titles and about app dialogs

The project is the one used by Flet build as the name of the executable.

Can be defined in the following ways:

[tool.poetry]   # or [project]
name = "xyz"

2. through the build command as --project xyz

It defaults to the name of you project directory.

Refs: windows, mac

[asmaier]

• project: project name for executable or bundle
• product: project display name that is shown in window titles and about app dialogs

Interesting. So then it is working as expected on windows. But it is not working as expected on Mac OS. When I run uv run flet build macos I see

Packaged Python app ✅
           Found "icon" image at /Users/<user>/git/temp/flet_test/src/assets/icon.png
           Run subprocess: ['/Users/<user>flutter/3.27.4/bin/flutter', 'build', 'macos', '--no-version-check', '--suppress-analytics',
           '--build-name', '0.1.0']
[10:22:02]
[10:22:06] Building macOS application...
           --- xcodebuild: WARNING: Using the first of multiple matching destinations:
           { platform:macOS, arch:arm64, id:00006030-000C682802D0001C, name:My Mac }
           { platform:macOS, arch:x86_64, id:00006030-000C682802D0001C, name:My Mac }
[10:22:34] ✓ Built build/macos/Build/Products/Release/PRODUCT_NAME.app (136.0MB)
           Built macOS bundle ✅
           Copying build output from: /Users/<user>/git/temp/flet_test/build/flutter/build/macos/Build/Products/Release/PRODUCT_NAME.app
[10:22:42] Copied build to build/macos directory ✅

In my pyproject.toml I have

[project]
name = "project-name"
...
[tool.flet]
...
product = "PRODUCT_NAME"

So on MacOS it is the product name that is used to name the app, not the project name, despite what it says in the cookiecutter template.

[asmaier]

Or even more clearer. If I run

uv run flet build --project PROJECT --product PRODUCT -v macos

I get

Building macOS application...
           --- xcodebuild: WARNING: Using the first of multiple matching destinations:
           { platform:macOS, arch:arm64, id:00006030-000C682802D0001C, name:My Mac }
           { platform:macOS, arch:x86_64, id:00006030-000C682802D0001C, name:My Mac }
[10:39:46] ✓ Built build/macos/Build/Products/Release/PRODUCT.app (136.0MB)
           Built macOS bundle ✅
           Copying build output from: /Users/<user>/git/temp/flet_test/build/flutter/build/macos/Build/Products/Release/PRODUCT.app
[10:39:53] Copied build to build/macos directory ✅

And actually If I try to run the same on windows

uv run flet build --project PROJECT --product PRODUCT -v windows

I get an error

CMake Error:
            Error evaluating generator expression:
[10:40:53]
              $<TARGET_FILE_DIR:flet_test>

            No target "flet_test"

On windows it seems the option --project doesn't work correctly and cannot overwrite the project name set in pyproject.toml. Only

uv run flet build --product PRODUCT -v windows

works as expected.

[ndonkoHenri]

So on MacOS it is the product name that is used to name the app, not the project name, despite what it says in the cookiecutter template.

We will have a look.

On windows it seems the option --project doesn't work correctly and cannot overwrite the project name set in pyproject.toml.

Weird. Can you share the full logs with the erroneous command using --v?

[asmaier]

Weird. Can you share the full logs with the erroneous command using --v?

Here it is:

flet_build_log.txt