diff --git a/pipeline/backend/docker/convert.go b/pipeline/backend/docker/convert.go
index a862418ad..692095b32 100644
--- a/pipeline/backend/docker/convert.go
+++ b/pipeline/backend/docker/convert.go
@@ -32,6 +32,8 @@ const minVolumeComponents = 2
 
 // returns a container configuration.
 func (e *docker) toConfig(step *types.Step) *container.Config {
+	e.windowsPathPatch(step)
+
 	config := &container.Config{
 		Image: step.Image,
 		Labels: map[string]string{
diff --git a/pipeline/backend/docker/convert_test.go b/pipeline/backend/docker/convert_test.go
index b114398f6..1e50869c0 100644
--- a/pipeline/backend/docker/convert_test.go
+++ b/pipeline/backend/docker/convert_test.go
@@ -15,8 +15,10 @@
 package docker
 
 import (
+	"encoding/base64"
 	"reflect"
 	"sort"
+	"strings"
 	"testing"
 
 	"github.com/docker/docker/api/types"
@@ -92,7 +94,7 @@ func TestSplitVolumeParts(t *testing.T) {
 }
 
 func TestToConfigSmall(t *testing.T) {
-	engine := docker{info: types.Info{OSType: "linux/riscv64"}}
+	engine := docker{info: types.Info{OSType: "linux", Architecture: "riscv64"}}
 
 	conf := engine.toConfig(&backend.Step{
 		Name:     "test",
@@ -122,7 +124,9 @@ func TestToConfigSmall(t *testing.T) {
 }
 
 func TestToConfigFull(t *testing.T) {
-	engine := docker{info: types.Info{OSType: "linux/riscv64"}}
+	engine := docker{
+		info: types.Info{OSType: "linux", Architecture: "riscv64"},
+	}
 
 	conf := engine.toConfig(&backend.Step{
 		Name:         "test",
@@ -182,3 +186,79 @@ func TestToConfigFull(t *testing.T) {
 		},
 	}, conf)
 }
+
+func TestToWindowsConfig(t *testing.T) {
+	engine := docker{
+		info: types.Info{OSType: "windows", Architecture: "x86_64"},
+	}
+
+	conf := engine.toConfig(&backend.Step{
+		Name:       "test",
+		UUID:       "23434553",
+		Type:       backend.StepTypeCommands,
+		Image:      "golang:1.2.3",
+		WorkingDir: "/src/abc",
+		Environment: map[string]string{
+			"TAGS":         "sqlite",
+			"CI_WORKSPACE": "/src",
+		},
+		Commands:    []string{"go test", "go vet ./..."},
+		ExtraHosts:  []backend.HostAlias{{Name: "t", IP: "1.2.3.4"}},
+		Volumes:     []string{"wp_default_abc:/src", "/cache:/cache/some/more", "test:/test"},
+		Networks:    []backend.Conn{{Name: "extra-net", Aliases: []string{"extra.net"}}},
+		DNS:         []string{"9.9.9.9", "8.8.8.8"},
+		Failure:     "fail",
+		AuthConfig:  backend.Auth{Username: "user", Password: "123456"},
+		NetworkMode: "nat",
+		Ports:       []backend.Port{{Number: 21}, {Number: 22}},
+	})
+
+	assert.NotNil(t, conf)
+	sort.Strings(conf.Env)
+	assert.EqualValues(t, &container.Config{
+		Image:        "golang:1.2.3",
+		WorkingDir:   "C:/src/abc",
+		AttachStdout: true,
+		AttachStderr: true,
+		Entrypoint:   []string{"powershell", "-noprofile", "-noninteractive", "-command", "[System.Text.Encoding]::UTF8.GetString([System.Convert]::FromBase64String($Env:CI_SCRIPT)) | iex"},
+		Labels: map[string]string{
+			"wp_step": "test",
+			"wp_uuid": "23434553",
+		},
+		Env: []string{
+			"CI_SCRIPT=CiRFcnJvckFjdGlvblByZWZlcmVuY2UgPSAnU3RvcCc7CiZjbWQgL2MgIm1rZGlyIGM6XHJvb3QiOwppZiAoJEVudjpDSV9ORVRSQ19NQUNISU5FKSB7CiRuZXRyYz1bc3RyaW5nXTo6Rm9ybWF0KCJ7MH1cX25ldHJjIiwkRW52OkhPTUUpOwoibWFjaGluZSAkRW52OkNJX05FVFJDX01BQ0hJTkUiID4+ICRuZXRyYzsKImxvZ2luICRFbnY6Q0lfTkVUUkNfVVNFUk5BTUUiID4+ICRuZXRyYzsKInBhc3N3b3JkICRFbnY6Q0lfTkVUUkNfUEFTU1dPUkQiID4+ICRuZXRyYzsKfTsKW0Vudmlyb25tZW50XTo6U2V0RW52aXJvbm1lbnRWYXJpYWJsZSgiQ0lfTkVUUkNfUEFTU1dPUkQiLCRudWxsKTsKW0Vudmlyb25tZW50XTo6U2V0RW52aXJvbm1lbnRWYXJpYWJsZSgiQ0lfU0NSSVBUIiwkbnVsbCk7CgpXcml0ZS1PdXRwdXQgKCcrICJnbyB0ZXN0IicpOwomIGdvIHRlc3Q7IGlmICgkTEFTVEVYSVRDT0RFIC1uZSAwKSB7ZXhpdCAkTEFTVEVYSVRDT0RFfQoKV3JpdGUtT3V0cHV0ICgnKyAiZ28gdmV0IC4vLi4uIicpOwomIGdvIHZldCAuLy4uLjsgaWYgKCRMQVNURVhJVENPREUgLW5lIDApIHtleGl0ICRMQVNURVhJVENPREV9Cgo=",
+			"CI_WORKSPACE=C:/src",
+			`HOME=c:\root`,
+			"SHELL=powershell.exe",
+			"TAGS=sqlite",
+		},
+		Volumes: map[string]struct{}{
+			"C:/cache/some/more": {},
+			"C:/src":             {},
+			"C:/test":            {},
+		},
+	}, conf)
+
+	ciScript, err := base64.StdEncoding.DecodeString(strings.TrimPrefix(conf.Env[0], "CI_SCRIPT="))
+	if assert.NoError(t, err) {
+		assert.EqualValues(t, `
+$ErrorActionPreference = 'Stop';
+&cmd /c "mkdir c:\root";
+if ($Env:CI_NETRC_MACHINE) {
+$netrc=[string]::Format("{0}\_netrc",$Env:HOME);
+"machine $Env:CI_NETRC_MACHINE" >> $netrc;
+"login $Env:CI_NETRC_USERNAME" >> $netrc;
+"password $Env:CI_NETRC_PASSWORD" >> $netrc;
+};
+[Environment]::SetEnvironmentVariable("CI_NETRC_PASSWORD",$null);
+[Environment]::SetEnvironmentVariable("CI_SCRIPT",$null);
+
+Write-Output ('+ "go test"');
+& go test; if ($LASTEXITCODE -ne 0) {exit $LASTEXITCODE}
+
+Write-Output ('+ "go vet ./..."');
+& go vet ./...; if ($LASTEXITCODE -ne 0) {exit $LASTEXITCODE}
+
+`, string(ciScript))
+	}
+}
diff --git a/pipeline/backend/docker/convert_win.go b/pipeline/backend/docker/convert_win.go
new file mode 100644
index 000000000..2bb658b76
--- /dev/null
+++ b/pipeline/backend/docker/convert_win.go
@@ -0,0 +1,79 @@
+// Copyright 2024 Woodpecker Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package docker
+
+import (
+	"path/filepath"
+	"regexp"
+	"strings"
+
+	"go.woodpecker-ci.org/woodpecker/v2/pipeline/backend/types"
+)
+
+const (
+	osTypeWindows              = "windows"
+	defaultWindowsDriverLetter = "C:"
+)
+
+var MustNotAddWindowsLetterPattern = regexp.MustCompile(`^(?:` +
+	// Drive letter followed by colon and optional backslash (C: or C:\)
+	`[a-zA-Z]:(?:\\|$)|` +
+
+	// Device path starting with \\ or // followed by .\ or ./ (\\.\  or //./  or \\./ or //.\ )
+	`(?:\\\\|//)\.(?:\\|/).*|` +
+
+	// UNC path starting with \\ or // followed by non-dot (\server or //server)
+	`(?:\\\\|//)[^.]|` +
+
+	// Relative path starting with .\ or ./ (.\path or ./path)
+	`\.(?:\\|/)` +
+	`)`)
+
+func (e *docker) windowsPathPatch(step *types.Step) {
+	// only patch if target is windows
+	if strings.ToLower(e.info.OSType) != osTypeWindows {
+		return
+	}
+
+	// patch volumes to have an letter if not already set
+	for i, vol := range step.Volumes {
+		volParts, err := splitVolumeParts(vol)
+		if err != nil || len(volParts) < 2 {
+			// ignore non valid volumes for now
+			continue
+		}
+
+		// fix source destination
+		if strings.HasPrefix(volParts[0], "/") {
+			volParts[0] = filepath.Join(defaultWindowsDriverLetter, volParts[0])
+		}
+
+		// fix mount destination
+		if !MustNotAddWindowsLetterPattern.MatchString(volParts[1]) {
+			volParts[1] = filepath.Join(defaultWindowsDriverLetter, volParts[1])
+		}
+		step.Volumes[i] = strings.Join(volParts, ":")
+	}
+
+	// patch workspace
+	if !MustNotAddWindowsLetterPattern.MatchString(step.WorkingDir) {
+		step.WorkingDir = filepath.Join(defaultWindowsDriverLetter, step.WorkingDir)
+	}
+	if ciWorkspace, ok := step.Environment["CI_WORKSPACE"]; ok {
+		if !MustNotAddWindowsLetterPattern.MatchString(ciWorkspace) {
+			step.Environment["CI_WORKSPACE"] = filepath.Join(defaultWindowsDriverLetter, ciWorkspace)
+		}
+	}
+}
diff --git a/pipeline/backend/docker/convert_win_test.go b/pipeline/backend/docker/convert_win_test.go
new file mode 100644
index 000000000..bfc71b148
--- /dev/null
+++ b/pipeline/backend/docker/convert_win_test.go
@@ -0,0 +1,44 @@
+// Copyright 2024 Woodpecker Authors
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package docker
+
+import "testing"
+
+func TestMustNotAddWindowsLetterPattern(t *testing.T) {
+	tests := map[string]bool{
+		`C:\Users`:           true,
+		`D:\Data`:            true,
+		`\\.\PhysicalDrive0`: true,
+		`//./COM1`:           true,
+		`E:`:                 true,
+		`\\server\share`:     true, // UNC path
+		`.\relative\path`:    true, // Relative path
+		`./path`:             true, // Relative with forward slash
+		`//server/share`:     true, // UNC with forward slashes
+		`not/a/windows/path`: false,
+		``:                   false,
+		`/usr/local`:         false,
+		`COM1`:               false,
+		`\\.`:                false, // Incomplete device path
+		`//`:                 false,
+	}
+
+	for testCase, expected := range tests {
+		result := MustNotAddWindowsLetterPattern.MatchString(testCase)
+		if result != expected {
+			t.Errorf("Test case %q: expected %v but got %v", testCase, expected, result)
+		}
+	}
+}