fix(env): Avoid automatic expansion of %% in env

CHANGELOG.md

@@ -10,6 +10,7 @@
 - **autoupdate:** Fix file hash extraction ([#5295](https://github.com/ScoopInstaller/Scoop/issues/5295))
 - **shortcuts:** Output correctly formatted path ([#5333](https://github.com/ScoopInstaller/Scoop/issues/5333))
 - **core:** Fix `is_in_dir` under Unix ([#5391](https://github.com/ScoopInstaller/Scoop/issues/5391))
+- **env:** Avoid automatic expansion of `%%` in env ([#5394](https://github.com/ScoopInstaller/Scoop/issues/5394))
 
 ### Code Refactoring
 

lib/core.ps1

@@ -662,10 +662,26 @@ function Invoke-ExternalCommand {
     return $true
 }
 
-function env($name,$global,$val='__get') {
-    $target = 'User'; if($global) {$target = 'Machine'}
-    if($val -eq '__get') { [environment]::getEnvironmentVariable($name,$target) }
-    else { [environment]::setEnvironmentVariable($name,$val,$target) }
+function env($name, $global, $val = '__get') {
+    $RegisterKey = if ($global) {
+        Get-Item -Path 'HKLM:\SYSTEM\CurrentControlSet\Control\Session Manager'
+    } else {
+        Get-Item -Path 'HKCU:'
+    }
+
+    if ($val -eq '__get') {
+        $EnvRegisterKey = $RegisterKey.OpenSubKey('Environment')
+        $RegistryValueOption = [Microsoft.Win32.RegistryValueOptions]::DoNotExpandEnvironmentNames
+        $EnvRegisterKey.GetValue($name, $null, $RegistryValueOption)
+    } else {
+        $EnvRegisterKey = $RegisterKey.OpenSubKey('Environment', $true)
+        $RegistryValueKind = if ($EnvRegisterKey.GetValue($name)) {
+            $EnvRegisterKey.GetValueKind($name)
+        } else {
+            [Microsoft.Win32.RegistryValueKind]::ExpandString
+        }
+        $EnvRegisterKey.SetValue($name, $val, $RegistryValueKind)
+    }
 }
 
 function isFileLocked([string]$path) {