diff --git a/command/plugins_required.go b/command/plugins_required.go
index 7ba301dcfcf..2fcaf60f384 100644
--- a/command/plugins_required.go
+++ b/command/plugins_required.go
@@ -83,11 +83,16 @@ func (c *PluginsRequiredCommand) RunContext(buildCtx context.Context, cla *Plugi
 		return ret
 	}
 
+	ext := ""
+	if runtime.GOOS == "windows" {
+		ext = ".exe"
+	}
 	opts := plugingetter.ListInstallationsOptions{
 		PluginDirectory: c.Meta.CoreConfig.Components.PluginConfig.PluginDirectory,
 		BinaryInstallationOptions: plugingetter.BinaryInstallationOptions{
 			OS:              runtime.GOOS,
 			ARCH:            runtime.GOARCH,
+			Ext:             ext,
 			APIVersionMajor: pluginsdk.APIVersionMajor,
 			APIVersionMinor: pluginsdk.APIVersionMinor,
 			Checksummers: []plugingetter.Checksummer{
diff --git a/packer/plugin.go b/packer/plugin.go
index 72549a03d0b..5939d6aa6ab 100644
--- a/packer/plugin.go
+++ b/packer/plugin.go
@@ -9,7 +9,6 @@ import (
 	"log"
 	"os"
 	"os/exec"
-	"path"
 	"path/filepath"
 	"regexp"
 	"runtime"
@@ -75,11 +74,17 @@ func (c *PluginConfig) Discover() error {
 		c.PluginDirectory, _ = PluginFolder()
 	}
 
+	ext := ""
+	if runtime.GOOS == "windows" {
+		ext = ".exe"
+	}
+
 	installations, err := plugingetter.Requirement{}.ListInstallations(plugingetter.ListInstallationsOptions{
 		PluginDirectory: c.PluginDirectory,
 		BinaryInstallationOptions: plugingetter.BinaryInstallationOptions{
 			OS:              runtime.GOOS,
 			ARCH:            runtime.GOARCH,
+			Ext:             ext,
 			APIVersionMajor: pluginsdk.APIVersionMajor,
 			APIVersionMinor: pluginsdk.APIVersionMinor,
 			Checksummers: []plugingetter.Checksummer{
@@ -97,7 +102,7 @@ func (c *PluginConfig) Discover() error {
 	// We'll use that later to register the components for each plugin
 	pluginMap := map[string]string{}
 	for _, install := range installations {
-		pluginBasename := path.Base(install.BinaryPath)
+		pluginBasename := filepath.Base(install.BinaryPath)
 		matches := extractPluginBasename.FindStringSubmatch(pluginBasename)
 		if len(matches) != 2 {
 			log.Printf("[INFO] - plugin %q could not have its name matched, ignoring", pluginBasename)
diff --git a/packer/plugin_folders.go b/packer/plugin_folders.go
index 09683d5f0bb..c7c1febd46c 100644
--- a/packer/plugin_folders.go
+++ b/packer/plugin_folders.go
@@ -13,13 +13,15 @@ import (
 	"github.com/hashicorp/packer-plugin-sdk/pathing"
 )
 
+var pathSep = fmt.Sprintf("%c", os.PathListSeparator)
+
 // PluginFolder returns the known plugin folder based on system.
 func PluginFolder() (string, error) {
 	if packerPluginPath := os.Getenv("PACKER_PLUGIN_PATH"); packerPluginPath != "" {
-		if strings.ContainsRune(packerPluginPath, os.PathListSeparator) {
+		if strings.Contains(packerPluginPath, pathSep) {
 			return "", fmt.Errorf("Multiple paths are no longer supported for PACKER_PLUGIN_PATH.\n"+
 				"This should be defined as one of the following options for your environment:"+
-				"\n* PACKER_PLUGIN_PATH=%v", strings.Join(strings.Split(packerPluginPath, ":"), "\n* PACKER_PLUGIN_PATH="))
+				"\n* PACKER_PLUGIN_PATH=%v", strings.Join(strings.Split(packerPluginPath, pathSep), "\n* PACKER_PLUGIN_PATH="))
 		}
 
 		return packerPluginPath, nil