diff --git a/Rakefile b/Rakefile
index 0834bca..fc639d8 100644
--- a/Rakefile
+++ b/Rakefile
@@ -35,14 +35,17 @@ require "fileutils"
 namespace :build do
   desc "Download cacert.pem"
   task :download_cacert do
-    url = URI("https://curl.se/ca/cacert.pem")
-    FileUtils.mkdir_p("lib/cert")
-    Net::HTTP.start(url.host, url.port, use_ssl: url.scheme == "https") do |http|
-      request = Net::HTTP::Get.new url
-      http.request request do |response|
-        open "lib/cert/cacert.pem.mozilla", "w" do |io|
-          response.read_body do |chunk|
-            io.write chunk
+    unless File.exist?("lib/cert/cacert.pem.mozilla")
+
+      url = URI("https://curl.se/ca/cacert.pem")
+      FileUtils.mkdir_p("lib/cert")
+      Net::HTTP.start(url.host, url.port, use_ssl: url.scheme == "https") do |http|
+        request = Net::HTTP::Get.new url
+        http.request request do |response|
+          open "lib/cert/cacert.pem.mozilla", "w" do |io|
+            response.read_body do |chunk|
+              io.write chunk
+            end
           end
         end
       end
@@ -52,7 +55,9 @@ end
 
 task build: "build:download_cacert"
 
-task default: ["build:download_cacert", :spec]
+task spec: "build:download_cacert"
+
+task default: :spec
 
 RSpec::Core::RakeTask.new(:spec)
 RuboCop::RakeTask.new
diff --git a/lib/tebako-runtime.rb b/lib/tebako-runtime.rb
index 14fa21e..ae24ca7 100644
--- a/lib/tebako-runtime.rb
+++ b/lib/tebako-runtime.rb
@@ -37,6 +37,7 @@
 # - an option to implement adapter 'AFTER'
 module TebakoRuntime
   PRE_REQUIRE_MAP = {
+    "excavate" => "tebako-runtime/pre/excavate",
     "seven_zip_ruby" => "tebako-runtime/pre/seven-zip"
   }.freeze
 
@@ -79,10 +80,10 @@ def self.process_all(name)
   # It targets ffi-compiler/ffi-compiler2 that use some functions of
   # deployed ffi to process other gems
   # THis approach is not compatible with tebako on Windows because ffi
-  # is deployed with (inplib) reference to target tebako package that is
+  # is deployed with (implib) reference to target tebako package that is
   # not available at deploy time
   def self.process_pass_through(name)
-    if name == "ffi" && RUBY_PLATFORM =~ /msys|mingw|cygwin/
+    if name == "ffi" && RUBY_PLATFORM =~ /mswin|mingw/
       puts "Replacing ffi ffi-platform-stub" if log_enabled
       res = original_require "tebako-runtime/pass-through/ffi-platform-stub"
     else
diff --git a/lib/tebako-runtime/memfs.rb b/lib/tebako-runtime/memfs.rb
index 98f5d06..5235af1 100644
--- a/lib/tebako-runtime/memfs.rb
+++ b/lib/tebako-runtime/memfs.rb
@@ -35,7 +35,7 @@
 # Module TebakoRuntime
 # Methods to extract files from memfs to temporary folder
 module TebakoRuntime
-  COMPILER_MEMFS = RUBY_PLATFORM =~ /msys|mingw|cygwin/ ? "A:/__tebako_memfs__" : "/__tebako_memfs__"
+  COMPILER_MEMFS = RUBY_PLATFORM =~ /mswin|mingw/ ? "A:/__tebako_memfs__" : "/__tebako_memfs__"
   COMPILER_MEMFS_LIB_CACHE = Pathname.new(Dir.mktmpdir("tebako-runtime-"))
 
   class << self
diff --git a/lib/tebako-runtime/pre/excavate.rb b/lib/tebako-runtime/pre/excavate.rb
new file mode 100644
index 0000000..aa60600
--- /dev/null
+++ b/lib/tebako-runtime/pre/excavate.rb
@@ -0,0 +1,31 @@
+# frozen_string_literal: true
+
+# Copyright (c) 2024 [Ribose Inc](https://www.ribose.com).
+# All rights reserved.
+# This file is a part of tebako
+#
+# Redistribution and use in source and binary forms, with or without
+# modification, are permitted provided that the following conditions
+# are met:
+# 1. Redistributions of source code must retain the above copyright
+#    notice, this list of conditions and the following disclaimer.
+# 2. Redistributions in binary form must reproduce the above copyright
+#    notice, this list of conditions and the following disclaimer in the
+#    documentation and/or other materials provided with the distribution.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+# ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
+# TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+# PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDERS OR CONTRIBUTORS
+# BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+# CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+# SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+# INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+# CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+# ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+# POSSIBILITY OF SUCH DAMAGE.
+
+# For some reason on Windows an attempt to require "seven_zip_ruby" from excavate fails
+# I cannot debug it effectively because of https://github.com/tamatebako/tebako/issues/119
+
+require "seven_zip_ruby"
diff --git a/lib/tebako-runtime/pre/seven-zip.rb b/lib/tebako-runtime/pre/seven-zip.rb
index 9f1bad2..31b3e9d 100644
--- a/lib/tebako-runtime/pre/seven-zip.rb
+++ b/lib/tebako-runtime/pre/seven-zip.rb
@@ -32,10 +32,11 @@
 module TebakoRuntime
   sevenz_lib = RUBY_PLATFORM.downcase.match(/mswin|mingw/) ? "7z*.dll" : "7z.so"
   sevenz_path = File.join(full_gem_path("seven-zip"), "lib", "seven_zip_ruby", sevenz_lib)
+  sevenz_paths = Dir.glob(sevenz_path)
   sevenz_new_folder = COMPILER_MEMFS_LIB_CACHE / "seven_zip_ruby"
   FileUtils.mkdir_p(sevenz_new_folder)
-  Dir.glob(sevenz_path).each do |file|
+  sevenz_paths.each do |file|
     FileUtils.cp(file, sevenz_new_folder)
   end
-  $LOAD_PATH.unshift(COMPILER_MEMFS_LIB_CACHE)
+  $LOAD_PATH.unshift(COMPILER_MEMFS_LIB_CACHE.to_s)
 end
diff --git a/lib/tebako-runtime/version.rb b/lib/tebako-runtime/version.rb
index 284bf36..f1bbc3b 100644
--- a/lib/tebako-runtime/version.rb
+++ b/lib/tebako-runtime/version.rb
@@ -26,5 +26,5 @@
 # POSSIBILITY OF SUCH DAMAGE.
 
 module TebakoRuntime
-  VERSION = "0.5.0"
+  VERSION = "0.5.1"
 end
diff --git a/spec/runtime_spec.rb b/spec/runtime_spec.rb
index a10b879..3752c5c 100644
--- a/spec/runtime_spec.rb
+++ b/spec/runtime_spec.rb
@@ -29,6 +29,8 @@
 
 # rubocop:disable Metrics/BlockLength
 RSpec.describe TebakoRuntime do
+  let(:tmpd) { tmpdir_name }
+
   it "has a version number" do
     expect(TebakoRuntime::VERSION).not_to be nil
   end
@@ -40,7 +42,6 @@ def tmpdir_name
   end
 
   it "extracts single file from memfs" do
-    tmpd = tmpdir_name
     test_file = File.join(__dir__, "fixtures", "files", "test1.file")
     expect(FileUtils).to receive(:cp_r).with([test_file], tmpd)
 
@@ -48,8 +49,6 @@ def tmpdir_name
   end
 
   it "extracts files from memfs by wildcard" do
-    tmpd = tmpdir_name
-
     test1_file = File.join(__dir__, "fixtures", "files", "test1.file")
     test2_file = File.join(__dir__, "fixtures", "files", "test2.file")
     test_files = File.join(__dir__, "fixtures", "files", "*.file")
@@ -60,7 +59,6 @@ def tmpdir_name
   end
 
   it "returns unchanged reference to non-memfs file" do
-    tmpd = tmpdir_name
     expect(TebakoRuntime.extract_memfs("#{tmpd}/test.file")).to eq("#{tmpd}/test.file")
   end
 
@@ -98,10 +96,11 @@ def tmpdir_name
 
     ref = TebakoRuntime.extract_memfs(File.join(TebakoRuntime::COMPILER_MEMFS, "test1.file"), cache_path: cache)
     expect(ref).to eq(File.join(cache, "test1.file"))
+
+    FileUtils.remove_dir(cache, true)
   end
 
   it "returns unchanged reference to non-memfs file with quoted name" do
-    tmpd = tmpdir_name
     expect(TebakoRuntime.extract_memfs("\"#{tmpd}/test.file\"")).to eq("\"#{tmpd}/test.file\"")
   end
 
@@ -182,16 +181,25 @@ def tmpdir_name
   end
 
   it "provides a pre-processor for seven-zip gem" do
-    sevenz_libs = RUBY_PLATFORM =~ /msys|mingw|cygwin/ ? ["7z.dll", "7z64.dll"] : ["7z.so"]
+    sevenz_libs = RUBY_PLATFORM =~ /mswin|mingw/ ? ["7z.dll", "7z64.dll"] : ["7z.so"]
     sevenz_libs.each do |sevenz_lib|
       sevenz_path = File.join(TebakoRuntime.full_gem_path("seven-zip"), "lib", "seven_zip_ruby", sevenz_lib).to_s
       sevenz_new_folder = TebakoRuntime::COMPILER_MEMFS_LIB_CACHE / "seven_zip_ruby"
 
-      expect(FileUtils).to receive(:cp).with(sevenz_path, sevenz_new_folder).and_call_original
+      expect(FileUtils).to receive(:cp) do |source, destination|
+        if RUBY_PLATFORM =~ /mswin|mingw/
+          expect(source.casecmp(sevenz_path)).to eq(0) # Case-insensitive comparison for Windows
+          expect(destination.casecmp(sevenz_new_folder)).to eq(0)
+        else
+          expect(source).to eq(sevenz_path) # Case-sensitive comparison for other platforms
+          expect(destination).to eq(sevenz_new_folder)
+        end
+      end.and_call_original
     end
+
     require "seven_zip_ruby"
 
-    expect($LOAD_PATH).to include(TebakoRuntime::COMPILER_MEMFS_LIB_CACHE)
+    expect($LOAD_PATH).to include(TebakoRuntime::COMPILER_MEMFS_LIB_CACHE.to_s)
   end
 end
 # rubocop:enable Metrics/BlockLength