diff --git a/Sources/SWBCore/SpecImplementations/Tools/LinkerTools.swift b/Sources/SWBCore/SpecImplementations/Tools/LinkerTools.swift
index 53861da9..c87c79f6 100644
--- a/Sources/SWBCore/SpecImplementations/Tools/LinkerTools.swift
+++ b/Sources/SWBCore/SpecImplementations/Tools/LinkerTools.swift
@@ -740,16 +740,12 @@ public final class LdLinkerSpec : GenericLinkerSpec, SpecIdentifierType, @unchec
             }
         }
 
-        var environment: [(String, String)] = self.environmentFromSpec(cbc, delegate)
-        // On Windows, some linker drivers require TMPDIR to be set.
-        if cbc.producer.hostOperatingSystem == .windows {
-            environment.append(("TMPDIR", cbc.scope.evaluate(BuiltinMacros.OBJROOT).str))
-        }
         // Compute the inputs and outputs.
         var inputs: [any PlannedNode] = inputPaths.map{ delegate.createNode($0) }
 
         await inputs.append(contentsOf: additionalInputDependencies(cbc, delegate, optionContext: discoveredCommandLineToolSpecInfo(cbc.producer, cbc.scope, delegate), lookup: lookup).map(delegate.createNode))
 
+        let environment: [(String, String)] = self.environmentFromSpec(cbc, delegate)
         // Add dependencies for any arguments indicating a file path.
         Self.addAdditionalDependenciesFromCommandLine(cbc, commandLine, EnvironmentBindings(environment), &inputs, &outputs, delegate)
 
diff --git a/Sources/SWBCore/SpecImplementations/Tools/TouchTool.swift b/Sources/SWBCore/SpecImplementations/Tools/TouchTool.swift
index e6997b72..57ab5f1a 100644
--- a/Sources/SWBCore/SpecImplementations/Tools/TouchTool.swift
+++ b/Sources/SWBCore/SpecImplementations/Tools/TouchTool.swift
@@ -42,8 +42,7 @@ final class TouchToolSpec : CommandLineToolSpec, SpecIdentifierType, @unchecked
                 delegate.error("Can't determine path to cmd.exe because the ComSpec environment variable is not set")
                 return
             }
-            // FIXME: Need to properly quote the path here, or generally handle this better
-            commandLine = [commandShellPath, "/c", "copy /b \"\(input.absolutePath.str)\" +,,"]
+            commandLine = [commandShellPath, "/c", "copy", "/b", input.absolutePath.str, "+,,"]
         } else {
             commandLine = ["/usr/bin/touch", "-c", input.absolutePath.str]
         }
diff --git a/Sources/SWBWindowsPlatform/Specs/WindowsCompile.xcspec b/Sources/SWBWindowsPlatform/Specs/WindowsCompile.xcspec
index 159969be..2945e91a 100644
--- a/Sources/SWBWindowsPlatform/Specs/WindowsCompile.xcspec
+++ b/Sources/SWBWindowsPlatform/Specs/WindowsCompile.xcspec
@@ -17,6 +17,8 @@
         Type = Compiler;
         BasedOn = "default:com.apple.compilers.llvm.clang.1_0";
         EnvironmentVariables = {
+            "TEMP" = "$(OBJROOT)";
+            "TMP" = "$(OBJROOT)";
         };
         Name = "Apple LLVM Windows";
         Description = "Apple LLVM Windows compiler";
diff --git a/Sources/SWBWindowsPlatform/Specs/WindowsLd.xcspec b/Sources/SWBWindowsPlatform/Specs/WindowsLd.xcspec
index b4ef6fbc..9b6cd229 100644
--- a/Sources/SWBWindowsPlatform/Specs/WindowsLd.xcspec
+++ b/Sources/SWBWindowsPlatform/Specs/WindowsLd.xcspec
@@ -21,7 +21,9 @@
         IsAbstract = Yes;
         SupportsInputFileList = No;
         EnvironmentVariables = {
-            "TEMP" = "$(TEMP)";
+            "TEMP" = "$(OBJROOT)";
+            "TMP" = "$(OBJROOT)";
+            "TMPDIR" = "$(OBJROOT)";
             "PATH" = "$(TOOLCHAIN_DIR)/usr/bin;$(DEVELOPER_DIR)/Runtimes/$(TOOLCHAIN_VERSION)/usr/bin;$(PATH)";
         };
         Options = (
diff --git a/Tests/SWBCoreTests/CommandLineSpecTests.swift b/Tests/SWBCoreTests/CommandLineSpecTests.swift
index f902a2dc..bc534914 100644
--- a/Tests/SWBCoreTests/CommandLineSpecTests.swift
+++ b/Tests/SWBCoreTests/CommandLineSpecTests.swift
@@ -1720,7 +1720,7 @@ import SWBMacro
         #expect(task.execDescription == "Touch input")
         if core.hostOperatingSystem == .windows {
             let commandShellPath = try #require(getEnvironmentVariable("ComSpec"), "Can't determine path to cmd.exe because the ComSpec environment variable is not set")
-            task.checkCommandLine([commandShellPath, "/c", "copy /b \"\(Path.root.join("tmp/input").str)\" +,,"])
+            task.checkCommandLine([commandShellPath, "/c", "copy", "/b", Path.root.join("tmp/input").str, "+,,"])
         } else {
             task.checkCommandLine(["/usr/bin/touch", "-c", Path.root.join("tmp/input").str])
         }