diff --git a/cmd/tools/modules/testing/common.v b/cmd/tools/modules/testing/common.v
index 69bf0f8387..814f8e4f6a 100644
--- a/cmd/tools/modules/testing/common.v
+++ b/cmd/tools/modules/testing/common.v
@@ -309,7 +309,7 @@ fn worker_trunner(mut p pool.PoolProcessor, idx int, thread_id int) voidptr {
 	} else {
 		fname.replace('.v', '')
 	}
-	generated_binary_fpath := os.join_path(tmpd, generated_binary_fname)
+	generated_binary_fpath := os.join_path_single(tmpd, generated_binary_fname)
 	if os.exists(generated_binary_fpath) {
 		if ts.rm_binaries {
 			os.rm(generated_binary_fpath) or {}
@@ -406,7 +406,7 @@ fn worker_trunner(mut p pool.PoolProcessor, idx int, thread_id int) voidptr {
 }
 
 pub fn vlib_should_be_present(parent_dir string) {
-	vlib_dir := os.join_path(parent_dir, 'vlib')
+	vlib_dir := os.join_path_single(parent_dir, 'vlib')
 	if !os.is_dir(vlib_dir) {
 		eprintln('$vlib_dir is missing, it must be next to the V executable')
 		exit(1)
@@ -427,7 +427,7 @@ pub fn prepare_test_session(zargs string, folder string, oskipped []string, main
 		eprintln('v compiler args: "$vargs"')
 	}
 	mut session := new_test_session(vargs, true)
-	files := os.walk_ext(os.join_path(parent_dir, folder), '.v')
+	files := os.walk_ext(os.join_path_single(parent_dir, folder), '.v')
 	mut mains := []string{}
 	mut skipped := oskipped.clone()
 	next_file: for f in files {
@@ -451,7 +451,7 @@ pub fn prepare_test_session(zargs string, folder string, oskipped []string, main
 		maxc := if c.len > 300 { 300 } else { c.len }
 		start := c[0..maxc]
 		if start.contains('module ') && !start.contains('module main') {
-			skipped_f := f.replace(os.join_path(parent_dir, ''), '')
+			skipped_f := f.replace(os.join_path_single(parent_dir, ''), '')
 			skipped << skipped_f
 		}
 		for skip_prefix in oskipped {
diff --git a/cmd/tools/modules/vgit/vgit.v b/cmd/tools/modules/vgit/vgit.v
index e4e158d21f..2a935dea10 100644
--- a/cmd/tools/modules/vgit/vgit.v
+++ b/cmd/tools/modules/vgit/vgit.v
@@ -76,7 +76,7 @@ pub fn prepare_vc_source(vcdir string, cdir string, commit string) (string, stri
 
 pub fn clone_or_pull(remote_git_url string, local_worktree_path string) {
 	// NB: after clone_or_pull, the current repo branch is === HEAD === master
-	if os.is_dir(local_worktree_path) && os.is_dir(os.join_path(local_worktree_path, '.git')) {
+	if os.is_dir(local_worktree_path) && os.is_dir(os.join_path_single(local_worktree_path, '.git')) {
 		// Already existing ... Just pulling in this case is faster usually.
 		scripting.run('git -C "$local_worktree_path"  checkout --quiet master')
 		scripting.run('git -C "$local_worktree_path"  pull     --quiet ')
@@ -107,7 +107,7 @@ pub mut:
 
 pub fn (mut vgit_context VGitContext) compile_oldv_if_needed() {
 	vgit_context.vexename = if os.user_os() == 'windows' { 'v.exe' } else { 'v' }
-	vgit_context.vexepath = os.real_path(os.join_path(vgit_context.path_v, vgit_context.vexename))
+	vgit_context.vexepath = os.real_path(os.join_path_single(vgit_context.path_v, vgit_context.vexename))
 	mut command_for_building_v_from_c_source := ''
 	mut command_for_selfbuilding := ''
 	if 'windows' == os.user_os() {
diff --git a/vlib/v/parser/comptime.v b/vlib/v/parser/comptime.v
index 184442e8dd..af2659fc9f 100644
--- a/vlib/v/parser/comptime.v
+++ b/vlib/v/parser/comptime.v
@@ -110,7 +110,7 @@ fn (mut p Parser) comptime_call() ast.ComptimeCall {
 			// check absolute path first
 			if !os.exists(abs_path) {
 				// ... look relative to the source file:
-				epath = os.real_path(os.join_path(os.dir(p.file_name), epath))
+				epath = os.real_path(os.join_path_single(os.dir(p.file_name), epath))
 				if !os.exists(epath) {
 					p.error_with_pos('"$epath" does not exist so it cannot be embedded',
 						spos)
@@ -144,11 +144,11 @@ fn (mut p Parser) comptime_call() ast.ComptimeCall {
 	tmpl_path := if is_html { '${fn_path.last()}.html' } else { path_of_literal_string_param }
 	// Looking next to the vweb program
 	dir := os.dir(compiled_vfile_path)
-	mut path := os.join_path(dir, fn_path_joined)
+	mut path := os.join_path_single(dir, fn_path_joined)
 	path += '.html'
 	path = os.real_path(path)
 	if !is_html {
-		path = os.join_path(dir, tmpl_path)
+		path = os.join_path_single(dir, tmpl_path)
 	}
 	if !os.exists(path) {
 		if is_html {
diff --git a/vlib/v/parser/tmpl.v b/vlib/v/parser/tmpl.v
index 8bb8cda75f..ed608d94e0 100644
--- a/vlib/v/parser/tmpl.v
+++ b/vlib/v/parser/tmpl.v
@@ -135,7 +135,7 @@ mut sb := strings.new_builder($lstartlength)\n
 				// an absolute path
 				templates_folder = ''
 			}
-			file_path := os.real_path(os.join_path(templates_folder, '$file_name$file_ext'))
+			file_path := os.real_path(os.join_path_single(templates_folder, '$file_name$file_ext'))
 			$if trace_tmpl ? {
 				eprintln('>>> basepath: "$basepath" , template_file: "$template_file" , fn_name: "$fn_name" , @include line: "$line" , file_name: "$file_name" , file_ext: "$file_ext" , templates_folder: "$templates_folder" , file_path: "$file_path"')
 			}
diff --git a/vlib/v/util/diff/diff.v b/vlib/v/util/diff/diff.v
index 490342a07c..4a0b6e437c 100644
--- a/vlib/v/util/diff/diff.v
+++ b/vlib/v/util/diff/diff.v
@@ -72,11 +72,11 @@ pub fn color_compare_files(diff_cmd string, file1 string, file2 string) string {
 }
 
 pub fn color_compare_strings(diff_cmd string, unique_prefix string, expected string, found string) string {
-	cdir := os.join_path(os.cache_dir(), unique_prefix)
+	cdir := os.join_path_single(os.cache_dir(), unique_prefix)
 	os.mkdir(cdir) or {}
 	ctime := time.sys_mono_now()
-	e_file := os.join_path(cdir, '${ctime}.expected.txt')
-	f_file := os.join_path(cdir, '${ctime}.found.txt')
+	e_file := os.join_path_single(cdir, '${ctime}.expected.txt')
+	f_file := os.join_path_single(cdir, '${ctime}.found.txt')
 	os.write_file(e_file, expected) or { panic(err) }
 	os.write_file(f_file, found) or { panic(err) }
 	res := color_compare_files(diff_cmd, e_file, f_file)
diff --git a/vlib/v/util/module.v b/vlib/v/util/module.v
index 60ed83faa0..e4832fcd01 100644
--- a/vlib/v/util/module.v
+++ b/vlib/v/util/module.v
@@ -13,7 +13,7 @@ pub fn qualify_import(pref &pref.Preferences, mod string, file_path string) stri
 	mod_paths << os.vmodules_paths()
 	mod_path := mod.replace('.', os.path_separator)
 	for search_path in mod_paths {
-		try_path := os.join_path(search_path, mod_path)
+		try_path := os.join_path_single(search_path, mod_path)
 		if os.is_dir(try_path) {
 			if m1 := mod_path_to_full_name(pref, mod, try_path) {
 				trace_mod_path_to_full_name(@LINE, mod, try_path, m1)
@@ -70,7 +70,7 @@ pub fn mod_path_to_full_name(pref &pref.Preferences, mod string, path string) ?s
 	mod_path := mod.replace('.', os.path_separator)
 	// go back through each parent in path_parts and join with `mod_path` to see the dir exists
 	for i := path_parts.len - 1; i > 0; i-- {
-		try_path := os.join_path(path_parts[0..i].join(os.path_separator), mod_path)
+		try_path := os.join_path_single(path_parts[0..i].join(os.path_separator), mod_path)
 		// found module path
 		if os.is_dir(try_path) {
 			// we know we are in one of the `vmod_folders`
diff --git a/vlib/v/util/recompilation/recompilation.v b/vlib/v/util/recompilation/recompilation.v
index 10892cae5d..1a4564c860 100644
--- a/vlib/v/util/recompilation/recompilation.v
+++ b/vlib/v/util/recompilation/recompilation.v
@@ -9,7 +9,7 @@ import os
 // V from source.
 pub fn disabling_file(vroot string) string {
 	tools_folder := os.join_path(vroot, 'cmd', 'tools')
-	res := os.join_path(tools_folder, '.disable_autorecompilation')
+	res := os.join_path_single(tools_folder, '.disable_autorecompilation')
 	return res
 }
 
diff --git a/vlib/v/util/util.v b/vlib/v/util/util.v
index 65d7e21dc9..89f766b366 100644
--- a/vlib/v/util/util.v
+++ b/vlib/v/util/util.v
@@ -46,7 +46,7 @@ pub fn set_vroot_folder(vroot_path string) {
 	// VEXE env variable is needed so that compiler.vexe_path()
 	// can return it later to whoever needs it:
 	vname := if os.user_os() == 'windows' { 'v.exe' } else { 'v' }
-	os.setenv('VEXE', os.real_path(os.join_path(vroot_path, vname)), true)
+	os.setenv('VEXE', os.real_path(os.join_path_single(vroot_path, vname)), true)
 	os.setenv('VCHILD', 'true', true)
 }
 
@@ -121,11 +121,11 @@ pub fn launch_tool(is_verbose bool, tool_name string, args []string) {
 	set_vroot_folder(vroot)
 	tool_args := args_quote_paths(args)
 	tools_folder := os.join_path(vroot, 'cmd', 'tools')
-	tool_basename := os.real_path(os.join_path(tools_folder, tool_name))
+	tool_basename := os.real_path(os.join_path_single(tools_folder, tool_name))
 	mut tool_exe := ''
 	mut tool_source := ''
 	if os.is_dir(tool_basename) {
-		tool_exe = path_of_executable(os.join_path(tool_basename, tool_name))
+		tool_exe = path_of_executable(os.join_path_single(tool_basename, tool_name))
 		tool_source = tool_basename
 	} else {
 		tool_exe = path_of_executable(tool_basename)
@@ -240,7 +240,7 @@ pub fn should_recompile_tool(vexe string, tool_source string, tool_name string,
 fn tool_source2name_and_exe(tool_source string) (string, string) {
 	sfolder := os.dir(tool_source)
 	tool_name := os.base(tool_source).replace('.v', '')
-	tool_exe := os.join_path(sfolder, path_of_executable(tool_name))
+	tool_exe := os.join_path_single(sfolder, path_of_executable(tool_name))
 	return tool_name, tool_exe
 }
 
@@ -357,8 +357,8 @@ fn non_empty(arg []string) []string {
 }
 
 pub fn check_module_is_installed(modulename string, is_verbose bool) ?bool {
-	mpath := os.join_path(os.vmodules_dir(), modulename)
-	mod_v_file := os.join_path(mpath, 'v.mod')
+	mpath := os.join_path_single(os.vmodules_dir(), modulename)
+	mod_v_file := os.join_path_single(mpath, 'v.mod')
 	murl := 'https://github.com/vlang/$modulename'
 	if is_verbose {
 		eprintln('check_module_is_installed: mpath: $mpath')
@@ -484,7 +484,7 @@ pub fn get_vtmp_folder() string {
 		return vtmp
 	}
 	uid := os.getuid()
-	vtmp = os.join_path(os.temp_dir(), 'v_$uid')
+	vtmp = os.join_path_single(os.temp_dir(), 'v_$uid')
 	if !os.exists(vtmp) || !os.is_dir(vtmp) {
 		os.mkdir_all(vtmp) or { panic(err) }
 	}
diff --git a/vlib/v/util/vtest/vtest.v b/vlib/v/util/vtest/vtest.v
index 948cf411d0..e89b57bcf3 100644
--- a/vlib/v/util/vtest/vtest.v
+++ b/vlib/v/util/vtest/vtest.v
@@ -14,7 +14,7 @@ pub fn filter_vtest_only(paths []string, config FilterVTestConfig) []string {
 	for relative_path in paths {
 		mut file := relative_path
 		if config.basepath.len > 0 {
-			file = os.join_path(config.basepath, file)
+			file = os.join_path_single(config.basepath, file)
 		}
 		if config.fix_slashes {
 			file = file.replace('\\', '/')