diff --git a/Gemfile b/Gemfile
index 8f9202c..5b2ba2a 100644
--- a/Gemfile
+++ b/Gemfile
@@ -62,10 +62,11 @@ group :plugins, :autodiscovery, optional: true do
 end
 
 # The plugins below are Supported (external): each needs a service or a command
-# the operator provides, and their specs exercise it rather than a double. They
-# are deliberately outside the `plugins` group, so that installing that group
-# leaves the suite runnable with nothing else set up. Select one of these by
-# its own name when you have what it talks to.
+# the operator provides for real use. They are deliberately outside the
+# `plugins` group, because installing all of their client gems is not useful
+# without those external systems. Their specs verify the local side of each
+# integration with doubles where appropriate. Select one by its own name when
+# you have what it talks to.
 group :memcached, optional: true do
   gem 'dalli'             # PublishMemcached, with a memcached server
 end
diff --git a/doc/PLUGINS.md b/doc/PLUGINS.md
index f785e83..57d1a11 100644
--- a/doc/PLUGINS.md
+++ b/doc/PLUGINS.md
@@ -1577,12 +1577,14 @@ headline edited between runs no longer republishes the article.
 
 #### StoreFile — **Supported**
 
-`store/file.rb`. Downloads what each link points at and rewrites the link to a
-`file://` URI, which is how `PublishAmazonS3` later knows it has a local file.
+`store/file.rb`. Downloads what each link points at and rewrites the link to an
+absolute `file:` URI for the saved file, which is how `PublishAmazonS3` later
+knows it has a local file. URI-reserved characters in the saved path are
+percent-encoded.
 
 | Key | Type | Meaning |
 | --- | --- | --- |
-| `path` | string | Directory to save into; created if absent. Required. |
+| `path` | string | Directory to save into; relative paths use the process working directory; created if absent. Required. |
 | `retry` | integer | Attempts after the first. Default `0`. |
 | `interval` | integer | Seconds between downloads. Default `0`. |
 | `access_key` | string | S3 only. Omit to use the SDK's own credential chain. |
@@ -1881,8 +1883,9 @@ timeout, so an unanswered request ends rather than hanging a `cron` job.
 
 #### PublishAmazonS3 — **Supported (external)**
 
-`publish/amazon_s3.rb`. Uploads files whose link is a `file://` URI to S3,
-normally after `StoreFile`.
+`publish/amazon_s3.rb`. Uploads files whose link is a `file:` URI to S3,
+normally after `StoreFile`. A percent-encoded URI path is decoded back to the
+local filesystem path before upload.
 
 | Key | Type | Meaning |
 | --- | --- | --- |
diff --git a/doc/VERSIONS b/doc/VERSIONS
index c171bef..6eceb56 100644
--- a/doc/VERSIONS
+++ b/doc/VERSIONS
@@ -10,6 +10,7 @@ v26.09 (Release Date: TBD)
 - Preserve nil-link pipeline items and remove SubscriptionText placeholder
   title and link values.
 - Preserve SubscriptionText TSV column positions and ignore empty input rows.
+- Preserve local file paths when StoreFile hands file URIs to PublishAmazonS3.
 
 v26.08 (2026-08-22)
 -------------------
diff --git a/lib/automatic/cli.rb b/lib/automatic/cli.rb
index eebe7b3..bd24aa4 100644
--- a/lib/automatic/cli.rb
+++ b/lib/automatic/cli.rb
@@ -5,7 +5,7 @@
 # License::     The GPL version 3, or LGPL version 3 (Dual License).
 # Contact::     idnanashi@gmail.com
 # Created::     Aug 14, 2026
-# Updated::     Sep  6, 2026
+# Updated::     Sep  9, 2026
 # Copyright::   Copyright (c) 2012-2026 Automatic Ruby Developers.
 #
 # Everything that belongs to being a command: option parsing, the subcommands,
@@ -208,9 +208,19 @@ def feedparser(argv)
       require 'automatic/feed_parser'
       require 'pp'
       url = argv.shift || missing_argument('feedparser')
+      validate_fetch_url(url)
       @stdout.puts Automatic::FeedParser.get_url(url).pretty_inspect
     end
 
+    # Converts only the URL validation failure `Automatic::Http.uri` already
+    # applies into the CLI's ordinary failure path; an unexpected error from
+    # inside FeedParser itself is left to propagate.
+    def validate_fetch_url(url)
+      Automatic::Http.uri(url)
+    rescue ArgumentError, URI::InvalidURIError => e
+      raise Automatic::Error, e.message
+    end
+
     def inspect_url(argv)
       require 'automatic/feed_parser'
       Automatic.require_optional('feedbag', needed_by: 'the inspect subcommand')
diff --git a/plugins/filter/join.rb b/plugins/filter/join.rb
index 739a0a9..4a99a95 100644
--- a/plugins/filter/join.rb
+++ b/plugins/filter/join.rb
@@ -87,11 +87,9 @@ def value(item, name)
       item.public_send(name).to_s.strip
     end
 
-    # Built here rather than through FeedMaker.create_pipeline, which drops an
-    # item whose link is nil -- and this item's link is nil deliberately. It is
-    # several articles at once, so there is no page it points at, and putting
-    # the first article's URL there would name a source for text that is not
-    # only from it.
+    # This joined item deliberately has no link. It is several articles at once,
+    # so there is no single page it points at; using the first article's URL would
+    # name a source for text that is not only from it.
     def feed(item_title, item_description)
       RSS::Maker.make('2.0') { |maker|
         maker.channel.title = 'Automatic Ruby'
diff --git a/plugins/publish/amazon_s3.rb b/plugins/publish/amazon_s3.rb
index 616948f..d348b64 100644
--- a/plugins/publish/amazon_s3.rb
+++ b/plugins/publish/amazon_s3.rb
@@ -5,13 +5,15 @@
 # License::     The GPL version 3, or LGPL version 3 (Dual License).
 # Contact::     idnanashi@gmail.com
 # Created::     Feb 24, 2014
-# Updated::     Aug 15, 2026
+# Updated::     Sep  9, 2026
 # Copyright::   Copyright (c) 2012-2026 Automatic Ruby Developers.
 
 module Automatic::Plugin
   class PublishAmazonS3
     require 'uri'
 
+    FILE_URI_ESCAPER = URI::RFC2396_Parser.new
+
     def initialize(config, pipeline = [])
       @config   = config || {}
       @pipeline = pipeline
@@ -35,7 +37,7 @@ def publish(feed)
 
       uri = URI.parse(feed.link)
       if uri.scheme == 'file'
-        upload(uri.path)
+        upload(file_path(uri))
       else
         Automatic::Log.puts('warn', 'Skip feed due to uri scheme is not file.')
       end
@@ -44,6 +46,10 @@ def publish(feed)
                           "Error detected with #{feed.link} in uploading AmazonS3: #{e.message}")
     end
 
+    def file_path(uri)
+      FILE_URI_ESCAPER.unescape(uri.path.to_s)
+    end
+
     def upload(path)
       key = target_key(path)
       File.open(path, 'rb') { |body| s3.put_object(bucket: bucket, key: key, body: body) } unless test?
diff --git a/plugins/store/file.rb b/plugins/store/file.rb
index 8456fe0..6624817 100644
--- a/plugins/store/file.rb
+++ b/plugins/store/file.rb
@@ -5,7 +5,7 @@
 # License::     The GPL version 3, or LGPL version 3 (Dual License).
 # Contact::     idnanashi@gmail.com
 # Created::     Feb 28, 2012
-# Updated::     Aug 15, 2026
+# Updated::     Sep  9, 2026
 # Copyright::   Copyright (c) 2012-2026 Automatic Ruby Developers.
 
 require 'fileutils'
@@ -18,6 +18,8 @@ class StoreFile
     # everything else uses and is accepted as well.
     S3_SCHEMES = %w[s3 s3n].freeze
 
+    FILE_URI_ESCAPER = URI::RFC2396_Parser.new
+
     def initialize(config, pipeline = [])
       @config   = config || {}
       @pipeline = pipeline
@@ -69,7 +71,13 @@ def get_file(url)
       uri = URI.parse(url)
       path = S3_SCHEMES.include?(uri.scheme) ? from_s3(uri) : download(url)
       Automatic::Log.puts('info', "Saved File: #{path}")
-      "file://#{path}"
+      file_uri(path)
+    end
+
+    def file_uri(path)
+      absolute_path = File.absolute_path(path.to_s)
+      escaped_path = FILE_URI_ESCAPER.escape(absolute_path)
+      URI::Generic.build(scheme: 'file', path: escaped_path).to_s
     end
 
     # Only HTTP and HTTPS are fetched: a link arrives from a feed, which is to
diff --git a/spec/lib/automatic/cli_spec.rb b/spec/lib/automatic/cli_spec.rb
index 7cb2f55..7edea2e 100644
--- a/spec/lib/automatic/cli_spec.rb
+++ b/spec/lib/automatic/cli_spec.rb
@@ -5,7 +5,7 @@
 # License::     The GPL version 3, or LGPL version 3 (Dual License).
 # Contact::     idnanashi@gmail.com
 # Created::     Aug 14, 2026
-# Updated::     Sep  6, 2026
+# Updated::     Sep  9, 2026
 # Copyright::   Copyright (c) 2012-2026 Automatic Ruby Developers.
 
 require File.expand_path(File.join(File.dirname(__FILE__), '../../spec_helper'))
@@ -80,6 +80,50 @@ def run(*argv, root_dir: APP_ROOT)
     end
   end
 
+  describe "the feedparser subcommand" do
+    it "parses a valid HTTP or HTTPS URL" do
+      allow(Automatic::FeedParser).to receive(:get_url).and_return("parsed")
+
+      expect(run("feedparser", "https://example.com/feed")).to eq Automatic::CLI::EXIT_SUCCESS
+      expect(Automatic::FeedParser).to have_received(:get_url).with("https://example.com/feed")
+      expect(out.string).to match(/parsed/)
+      expect(err.string).to be_empty
+    end
+
+    it "rejects a URL whose scheme is not HTTP or HTTPS" do
+      expect(Automatic::FeedParser).not_to receive(:get_url)
+
+      expect(run("feedparser", "file:///etc/passwd")).to eq Automatic::CLI::EXIT_FAILURE
+      expect(out.string).to be_empty
+      expect(err.string).to match(/automatic: not an HTTP or HTTPS URL:/)
+    end
+
+    it "rejects an HTTP or HTTPS URL with no host" do
+      expect(Automatic::FeedParser).not_to receive(:get_url)
+
+      expect(run("feedparser", "https:/feed")).to eq Automatic::CLI::EXIT_FAILURE
+      expect(out.string).to be_empty
+      expect(err.string).to match(/automatic: HTTP or HTTPS URL has no host:/)
+    end
+
+    it "rejects a URL that fails to parse as a URI syntax error" do
+      expect(Automatic::FeedParser).not_to receive(:get_url)
+
+      expect(run("feedparser", "http://[")).to eq Automatic::CLI::EXIT_FAILURE
+      expect(out.string).to be_empty
+      expect(err.string).to match(/\Aautomatic: /)
+    end
+
+    it "propagates an unexpected internal ArgumentError from FeedParser, unconverted" do
+      allow(Automatic::FeedParser).to receive(:get_url)
+        .and_raise(ArgumentError, 'internal feed parser defect')
+
+      expect {
+        run("feedparser", "https://example.com/feed")
+      }.to raise_error(ArgumentError, /internal feed parser defect/)
+    end
+  end
+
   describe "the inspect subcommand" do
     it "fails cleanly when no feed is discovered" do
       stub_const("Feedbag", Class.new)
diff --git a/spec/plugins/publish/amazon_s3_spec.rb b/spec/plugins/publish/amazon_s3_spec.rb
index 3543320..00a8e59 100644
--- a/spec/plugins/publish/amazon_s3_spec.rb
+++ b/spec/plugins/publish/amazon_s3_spec.rb
@@ -5,7 +5,7 @@
 # License::     The GPL version 3, or LGPL version 3 (Dual License).
 # Contact::     idnanashi@gmail.com
 # Created::     Feb 25, 2014
-# Updated::     Aug 15, 2026
+# Updated::     Sep  9, 2026
 # Copyright::   Copyright (c) 2012-2026 Automatic Ruby Developers.
 
 require File.expand_path(File.dirname(__FILE__) + '../../../spec_helper')
@@ -63,6 +63,25 @@
     end
   end
 
+  context 'with a percent-encoded file URI' do
+    it 'decodes the URI path back to the local filesystem path before uploading' do
+      Dir.mktmpdir do |dir|
+        path = File.join(dir, 'a photo.png')
+        File.binwrite(path, 'x')
+
+        escaped_path = URI::RFC2396_Parser.new.escape(path)
+        link = URI::Generic.build(scheme: 'file', path: escaped_path).to_s
+
+        plugin = Automatic::Plugin::PublishAmazonS3.new(
+          settings,
+          AutomaticSpec.generate_pipeline { feed { item link } }
+        )
+        plugin.should_receive(:upload).with(path).and_call_original
+        plugin.run.should have(1).feed
+      end
+    end
+  end
+
   describe 'the client settings' do
     it 'passes the Recipe credentials through' do
       plugin = Automatic::Plugin::PublishAmazonS3.new(settings.merge('region' => 'ap-northeast-1'))
diff --git a/spec/plugins/store/file_spec.rb b/spec/plugins/store/file_spec.rb
index 51b5859..ccd9516 100644
--- a/spec/plugins/store/file_spec.rb
+++ b/spec/plugins/store/file_spec.rb
@@ -5,7 +5,7 @@
 # License::     The GPL version 3, or LGPL version 3 (Dual License).
 # Contact::     idnanashi@gmail.com
 # Created::     Mar  4, 2012
-# Updated::     Aug 14, 2026
+# Updated::     Sep  9, 2026
 # Copyright::   Copyright (c) 2012-2026 Automatic Ruby Developers.
 
 require File.expand_path(File.dirname(__FILE__) + '../../../spec_helper')
@@ -88,6 +88,30 @@
     end
   end
 
+  it "rewrites a relative, space-containing path to an absolute, escaped file URI" do
+    relative_dir = "automatic-store-file-spec #{Process.pid}"
+    FileUtils.mkdir_p(relative_dir)
+    begin
+      Automatic::Http.stub(:read).and_return('a body')
+      instance = Automatic::Plugin::StoreFile.new(
+        { "path" => relative_dir },
+        AutomaticSpec.generate_pipeline { feed { item "https://example.com/a/photo.png" } }
+      )
+
+      returned = instance.run
+      saved_path = File.join(relative_dir, 'photo.png')
+      uri = URI.parse(returned[0].items[0].link)
+
+      uri.scheme.should == 'file'
+      uri.host.to_s.should be_empty
+      uri.to_s.should include('%20')
+      URI::RFC2396_Parser.new.unescape(uri.path).should == File.absolute_path(saved_path)
+      File.read(saved_path).should == 'a body'
+    ensure
+      FileUtils.rm_rf(relative_dir)
+    end
+  end
+
   # `s3n` is what Recipes written for this plugin use; `s3` is the spelling
   # everything else uses and is accepted as well. Both go to the SDK rather
   # than over HTTP.