reverse-skills-max: initial public release (restored, redacted, hardened)
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our-skills/dotnet-winui3-reverse-engineering/SKILL.md
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our-skills/dotnet-winui3-reverse-engineering/SKILL.md
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name: dotnet-winui3-reverse-engineering
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description: "Decompile a WinUI 3 / Windows App SDK MSIX-packaged .NET app to C# source + extract XBF resources from PRI"
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---
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# Reverse Engineering WinUI 3 / Windows App SDK .NET Applications
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## When to use
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When you need to decompile a UWP/WinUI 3/Windows App SDK MSIX-packaged .NET application to readable C# source code.
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## Prerequisites
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- `dotnet` SDK installed
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- `ilspycmd` (install via `dotnet tool install --global ilspycmd`)
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- `makepri.exe` from Windows SDK (usually at `C:\Program Files (x86)\Windows Kits\10\bin\<version>\x64\makepri.exe`)
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- Target app installed as MSIX (in `C:\Program Files\WindowsApps\`)
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## Procedure
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### 1. Locate the app
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```powershell
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# Find running process
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Get-Process <AppName> | Select-Object Id,Path
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# Or search WindowsApps
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Get-ChildItem "C:\Program Files\WindowsApps" -Filter "*<AppName>*"
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```
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### 2. Identify the main DLL
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WinUI 3 apps have a thin native .exe loader (~400KB) and the real logic in `<AppName>.dll` (several MB). Check for `coreclr.dll`, `hostfxr.dll` → .NET 8 runtime.
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### 3. Decompile C# with ILSpy
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```bash
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# Basic decompile (C# only, no XAML)
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ilspycmd "<AppName>.dll" -p -o "<output_dir>" -r "<install_dir>"
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# With BAML→XAML (works for WPF, NOT for WinUI 3)
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ilspycmd "<AppName>.dll" -p -o "<output_dir>" --decompile-baml -r "<install_dir>"
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```
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**Important:** WinUI 3 compiles XAML to XBF (XAML Binary Format) v2.1, NOT BAML. `--decompile-baml` will NOT produce XAML files. XBF files are embedded in `resources.pri`.
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### 4. Fix csproj for build
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- ILSpy generates `<Reference>` with `HintPath` pointing to install dir — copy DLLs to local `libs/` folder
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- Change `<LangVersion>15.0</LangVersion>` to `<LangVersion>preview</LangVersion>` (SDK 10 doesn't support 15.0)
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- Set `<GenerateAssemblyInfo>False</GenerateAssemblyInfo>` to avoid conflicts
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- Copy `Microsoft.WindowsAppRuntime.dll` (native, ~1.3MB) to output — it's NOT copied by default
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### 5. Extract XBF from resources.pri
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```bash
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# Dump PRI to XML
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makepri.exe dump /if "<install_dir>\resources.pri" /of "<output.xml" /dt detailed /o
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```
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Then extract XBF binaries (they're Base64-encoded `EmbeddedData` entries):
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- Look for `<NamedResource name="*.xbf">` entries with `<Candidate type="EmbeddedData">`
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- Base64 value starts with `WEJG` (= "XBF" in Base64)
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- Decode Base64 → write to .xbf files preserving directory structure
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### 6. XBF v2.1 format notes
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- Header: magic(4) + metadataSize(uint32) + nodeSize(uint32) = 12 bytes
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- Metadata section starts at byte 12, contains: version(2×uint32) + 6 table offsets(uint64) + hash(64 bytes)
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- **Table offsets are RELATIVE to metadata start (byte 12), not absolute file offsets**
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- String table: count(uint32) + entries [len(uint32) + UTF-16LE chars + 2-byte padding]
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- Type/Property tables: 12 bytes per entry (3×uint32), NOT 8 bytes like v1.0
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- Assembly/TypeNamespace tables may have 0 entries
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- Node section: starts at byte 12+metadataSize, uses different encoding than v1.0
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- **No working XBF v2.1→XAML decompiler exists** (LibXbf/XbfDecompiler only support v1.0/v2.0)
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- Best path to XAML: runtime hook `Application.LoadComponent` in live app + serialize visual tree
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### 7. Smoke-launch limitations
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WinUI 3 apps CANNOT run standalone without MSIX registration:
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- `Microsoft.UI.Xaml.Application.Start()` requires WinRT activation factory
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- WinRT activation needs package identity (AppX registration)
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- Error: `FileNotFoundException` in `WinRT.ActivationFactory` → `BaseActivationFactory`
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- To launch: create temporary AppX manifest + `Add-AppxPackage`, or run inside original MSIX context
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### 8. Known artifacts in decompiled code
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- `//IL_XXXX: Unknown result type` comments in 60+ files (WinRT projection IL)
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- `_003C_003Ec` compiler-generated closure classes (from lambda captures)
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- `__KnownINotifyPropertyChangedArgs` / `__KnownINotifyPropertyChangingArgs` (CommunityToolkit.Mvvm internals)
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- These compile as warnings (CS8632, CS0618) but don't break the build
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- **GREEN build ≠ behavior-equivalent to original** — WinRT projection stubs may be semantically incorrect
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## OmniRoute provider architecture (for forks)
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- Provider definitions: `src/shared/constants/providers/` split by auth type:
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- `noauth.ts` — free, no API key (opencode, felo, duckduckgo)
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- `apikey/` — split into `frontier-labs.ts`, `gateways.ts`, `inference-hosts.ts`, `enterprise-cloud.ts`, `regional.ts`, `specialty-media.ts`
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- `oauth.ts` — OAuth providers (cursor, zed, kiro)
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- `web-cookie.ts` — browser cookie auth
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- `local.ts` — Ollama, LM Studio, vLLM
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- Provider format: `{ id, alias, name, icon, color, textIcon, website, authHint?, hasFree?, freeNote?, serviceKinds?, notice? }`
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- Models: `src/shared/constants/models.ts` + `src/lib/providers/staticModels.ts`
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- Aggregated in `providers.ts` → `AI_PROVIDERS` proxy
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