--- a/mozilla/config.py
+++ b/mozilla/config.py
@@ -1053,17 +1053,17 @@ PLATFORM_VARS = {
                 'SYMBOL_SERVER_HOST': localconfig.SYMBOL_SERVER_HOST,
                 'SYMBOL_SERVER_USER': 'ffxbld',
                 'SYMBOL_SERVER_PATH': SYMBOL_SERVER_PATH,
                 'POST_SYMBOL_UPLOAD_CMD': SYMBOL_SERVER_POST_UPLOAD_CMD,
                 'SYMBOL_SERVER_SSH_KEY': "/c/Users/cltbld/.ssh/ffxbld_rsa",
                 'PDBSTR_PATH': '/c/Program Files (x86)/Windows Kits/8.0/Debuggers/x64/srcsrv/pdbstr.exe',
                 'HG_SHARE_BASE_DIR': 'c:/builds/hg-shared',
                 'BINSCOPE': 'C:\Program Files (x86)\Microsoft\SDL BinScope\BinScope.exe',
-                'PATH': "${MOZILLABUILD}nsis-3.0b1;${MOZILLABUILD}nsis-2.46u;${MOZILLABUILD}python27;${MOZILLABUILD}buildbotve\\scripts;${PATH}",
+                'PATH': "${MOZILLABUILD}\\nsis-3.0b1;${MOZILLABUILD}\\nsis-2.46u;${MOZILLABUILD}\\python27;${MOZILLABUILD}\\buildbotve\\scripts;${PATH}",
             },
             'enable_checktests': True,
             'talos_masters': GLOBAL_VARS['talos_masters'],
             'test_pretty_names': False,
             'l10n_check_test': True,
             # These refer to items in passwords.secrets
             # nightly_signing_servers defaults to dep-signing because we don't want
             # random new branches to accidentally use nightly-signing, which signs
@@ -1126,17 +1126,17 @@ PLATFORM_VARS = {
                 'SYMBOL_SERVER_HOST': localconfig.SYMBOL_SERVER_HOST,
                 'SYMBOL_SERVER_USER': 'ffxbld',
                 'SYMBOL_SERVER_PATH': SYMBOL_SERVER_PATH,
                 'POST_SYMBOL_UPLOAD_CMD': SYMBOL_SERVER_POST_UPLOAD_CMD,
                 'SYMBOL_SERVER_SSH_KEY': "/c/Users/cltbld/.ssh/ffxbld_rsa",
                 'MOZ_SYMBOLS_EXTRA_BUILDID': 'win64',
                 'PDBSTR_PATH': '/c/Program Files (x86)/Windows Kits/8.0/Debuggers/x64/srcsrv/pdbstr.exe',
                 'HG_SHARE_BASE_DIR': 'c:/builds/hg-shared',
-                'PATH': "${MOZILLABUILD}python27;${MOZILLABUILD}buildbotve\\scripts;${PATH}",
+                'PATH': "${MOZILLABUILD}\\nsis-3.0b1;${MOZILLABUILD}\\nsis-2.46u;${MOZILLABUILD}\\python27;${MOZILLABUILD}\\buildbotve\\scripts;${PATH}",
             },
             'enable_opt_unittests': False,
             'enable_checktests': True,
             'talos_masters': GLOBAL_VARS['talos_masters'],
             'test_pretty_names': True,
             'l10n_check_test': True,
             # These refer to items in passwords.secrets
             # nightly_signing_servers defaults to dep-signing because we don't want
@@ -1485,17 +1485,17 @@ PLATFORM_VARS = {
             'stage_product': 'firefox',
             'stage_platform': 'win32-debug',
             'enable_shared_checkouts': True,
             'env': {
                 'MOZ_OBJDIR': OBJDIR,
                 'XPCOM_DEBUG_BREAK': 'stack-and-abort',
                 'HG_SHARE_BASE_DIR': 'c:/builds/hg-shared',
                 'BINSCOPE': 'C:\Program Files (x86)\Microsoft\SDL BinScope\BinScope.exe',
-                'PATH': "${MOZILLABUILD}nsis-3.0b1;${MOZILLABUILD}nsis-2.46u;${MOZILLABUILD}python27;${MOZILLABUILD}buildbotve\\scripts;${PATH}",
+                'PATH': "${MOZILLABUILD}\\nsis-3.0b1;${MOZILLABUILD}\\nsis-2.46u;${MOZILLABUILD}\\python27;${MOZILLABUILD}\\buildbotve\\scripts;${PATH}",
             },
             'enable_unittests': False,
             'enable_checktests': True,
             'talos_masters': None,
             'nightly_signing_servers': 'dep-signing',
             'dep_signing_servers': 'dep-signing',
             'tooltool_manifest_src': 'browser/config/tooltool-manifests/win32/releng.manifest',
             'tooltool_script': ['python', '/c/mozilla-build/tooltool.py'],
@@ -1536,17 +1536,17 @@ PLATFORM_VARS = {
             'stage_product': 'firefox',
             'stage_platform': 'win64-debug',
             'enable_shared_checkouts': True,
             'env': {
                 'MOZ_OBJDIR': OBJDIR,
                 'XPCOM_DEBUG_BREAK': 'stack-and-abort',
                 'HG_SHARE_BASE_DIR': 'c:/builds/hg-shared',
                 'BINSCOPE': 'C:\Program Files (x86)\Microsoft\SDL BinScope\BinScope.exe',
-                'PATH': "${MOZILLABUILD}nsis-3.0b1;${MOZILLABUILD}nsis-2.46u;${MOZILLABUILD}python27;${MOZILLABUILD}buildbotve\\scripts;${PATH}",
+                'PATH': "${MOZILLABUILD}\\nsis-3.0b1;${MOZILLABUILD}\\nsis-2.46u;${MOZILLABUILD}\\python27;${MOZILLABUILD}\\buildbotve\\scripts;${PATH}",
             },
             'enable_unittests': False,
             'enable_checktests': True,
             'talos_masters': None,
             'nightly_signing_servers': 'dep-signing',
             'dep_signing_servers': 'dep-signing',
             'consider_for_nightly': False,
             'tooltool_manifest_src': 'browser/config/tooltool-manifests/win64/releng.manifest',