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Clarify DOTNET_ROOT documentation #47059

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Clarify DOTNET_ROOT documentation
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Update docs/core/tools/dotnet-environment-variables.md
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10 changes: 9 additions & 1 deletion docs/core/tools/dotnet-environment-variables.md
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Expand Up @@ -199,7 +199,15 @@
- GitHub issue [dotnet/core#7699](https://github.com/dotnet/core/issues/7699)
- GitHub issue [dotnet/runtime#79237](https://github.com/dotnet/runtime/issues/79237)

This environment variable is used only when running apps via generated executables (apphosts). `DOTNET_ROOT(x86)` is used instead when running a 32-bit executable on a 64-bit OS. `DOTNET_ROOT_X64` is used instead when running a 64-bit executable on an ARM64 OS.
These environment variables are used only when running apps via generated executables (apphosts). The order in which the environment variables are considered is:

1. `DOTNET_ROOT_<ARCH>`, where `<ARCH>` is the architecture of the running executable (apphost).
- For example:

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docs/core/tools/dotnet-environment-variables.md:205:19 MD009/no-trailing-spaces Trailing spaces [Expected: 0 or 2; Actual: 1] https://github.com/DavidAnson/markdownlint/blob/v0.38.0/doc/md009.md
- `DOTNET_ROOT_ARM64` is used for an arm64 process.
- `DOTNET_ROOT_X64` is used for an x64 process. This may be running on x64 or arm64 architecture.
- `DOTNET_ROOT_X86` is used for an x86 process. This may be running on x86 or x64 architecture.
2. `DOTNET_ROOT(x86)` is used when running 32-bit process on 64-bit Windows. In other cases this environment variable is ignored.
3. `DOTNET_ROOT`

### `DOTNET_HOST_PATH`

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