diff --git a/nix/README.md b/nix/README.md
index dcfedcd..9010adb 100644
--- a/nix/README.md
+++ b/nix/README.md
@@ -5,18 +5,17 @@ The Nix configuration builds nim-sds by calling nimble tasks directly (no Makefi
 ## Architecture
 
 ```
-flake.nix          — Entry point, defines packages and dev shell
+flake.nix           — Entry point, defines packages, dev shell, and utility apps
 ├── nix/default.nix — Build derivation: configures env, runs nim <task> sds.nims
 ├── nix/shell.nix   — Dev shell: sets up NIMBLE_DIR, nimble-links, NIM_LIB_DIR
 └── nix/tools.nix   — Helper: extracts version from sds.nimble
 ```
 
-The `nimbusBuildSystem` flake input is used **only** for its pinned Nim compiler.
+The Nim compiler comes from nixpkgs (pinned to 24.11, Nim 2.2.4).
 All build logic lives in `sds.nimble` (nimble tasks).
 
 ## Shell
 
-A development shell can be started using:
 ```sh
 nix develop '.?submodules=1'
 ```
@@ -34,15 +33,10 @@ nix build '.?submodules=1#libsds-android-arm64'
 ```
 
 The `?submodules=1` part is required because vendored dependencies are git submodules.
-For more details see: https://github.com/NixOS/nix/issues/4423
 
-## Testing
+## Utility apps
 
 ```sh
-nix flake check '.?submodules=1'
-```
-
-Or inside the dev shell:
-```sh
-nimble test
+nix run '.#setup'    # Initialize git submodules (run once after clone)
+nix run '.#clean'    # Garbage-collect the Nix store
 ```
diff --git a/scripts/build_windows.sh b/scripts/build_windows.sh
deleted file mode 100644
index 24987ab..0000000
--- a/scripts/build_windows.sh
+++ /dev/null
@@ -1,42 +0,0 @@
-#!/bin/sh
-
-echo "- - - - - - - - - - Windows Setup Script - - - - - - - - - -"
-
-success_count=0
-failure_count=0
-
-# Function to execute a command and check its status
-execute_command() {
-    echo "Executing: $1"
-    if eval "$1"; then
-        echo -e "✓ Command succeeded \n"
-        ((success_count++))
-    else
-        echo -e "✗ Command failed \n"
-        ((failure_count++))
-    fi
-}
-
-echo "1. -.-.-.-- Set PATH -.-.-.-"
-export PATH="/c/msys64/usr/bin:/c/msys64/mingw64/bin:/c/msys64/usr/lib:/c/msys64/mingw64/lib:$PATH"
-
-echo "2. -.-.-.- Verify dependencies -.-.-.-"
-execute_command "which gcc g++ make cmake cargo upx rustc python"
-
-echo "3. -.-.-.- Updating submodules -.-.-.-"
-execute_command "git submodule update --init --recursive"
-
-echo "4. -.-.-.- Creating tmp directory -.-.-.-"
-execute_command "mkdir -p tmp"
-
-echo "5. -.-.-.- Building Nim -.-.-.-"
-cd vendor/nimbus-build-system/vendor/Nim
-execute_command "./build_all.bat"
-cd ../../../..
-
-echo "6. -.-.-.- Building libsds -.-.-.- "
-execute_command "make libsds STATIC=0 V=3 -j8"
-
-echo "Windows setup completed successfully!"
-echo "✓ Successful commands: $success_count"
-echo "✗ Failed commands: $failure_count"
diff --git a/scripts/generate_nimble_links.sh b/scripts/generate_nimble_links.sh
index 3f3f6b6..b61543e 100755
--- a/scripts/generate_nimble_links.sh
+++ b/scripts/generate_nimble_links.sh
@@ -1,8 +1,7 @@
 #!/usr/bin/env bash
 
-# This script creates nimble-link files for all vendored Nim submodules.
-# It replaces the dependency on nimbus-build-system's create_nimble_link.sh
-# by inlining the same logic.
+# This script creates nimble-link files for all vendored Nim submodules,
+# allowing Nim's import resolver to find them.
 #
 # Required env vars:
 #   NIMBLE_DIR  — directory where nimble-link packages are created