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Yann GEFFROTIN edited this page Aug 22, 2025 · 5 revisions

How to Build FlashDevelop 5 with Microsoft Visual Studio 2022 IDE on Windows 11

Be sure to have sufficient amount of free space before installing.
Go to the Microsoft store and search “Microsoft Visual Studio Community 2022”

Click install
Use visual studio installer
Select C# because FlashDevelop use it at 64.5%

Choose if you trust github.com
Download “master branch” on https://github.com/fdorg/flashdevelop

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  Unzip the solution.
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Open “a project or a solution” FlashDevelop master Source Code in “Microsoft Visual Studio 2022” or later.

Choose Flashdevelop.sln
You need to download and install .NET Framework 4.0 or superior. (4.8 developer recommended)
Configure target framework.

Go in “Solution explorer”, search and right click “FlashDevelop”, select “Build” solution

Install missing dependencies if any. (.NET Framework 2, .NET Framework 3, .NET Framework 3.5)
Read error messages ; if any, and take corrective actions. i. If the program couldn’t process a file “*.resx” -> search it, find it and right click -> “Unblock” it. ii. CS0121 : “The call is ambiguous between the following methods or properties”

Test Build in FlashDevelop > Bin > Debug > FlashDevelop.exe on Microsoft Windows.

You should have a “FlashDevelop64.exe” available.
The app should launch.
Create or Import a ‘AS3 file’ or a ‘*.as3proj’