diff --git a/Gemfile.lock b/Gemfile.lock
index bd32562..e273be7 100644
--- a/Gemfile.lock
+++ b/Gemfile.lock
@@ -2,6 +2,7 @@ PATH
   remote: .
   specs:
     obsidian-parser (0.7.0)
+      marcel (~> 0.3.1)
       markly (~> 0.7.0)
 
 GEM
@@ -13,8 +14,17 @@ GEM
     json (2.6.3)
     language_server-protocol (3.17.0.3)
     lint_roller (1.1.0)
+    marcel (0.3.3)
+      mimemagic (~> 0.3.2)
     markly (0.7.0)
     method_source (1.0.0)
+    mimemagic (0.3.10)
+      nokogiri (~> 1)
+      rake
+    nokogiri (1.15.4-x86_64-darwin)
+      racc (~> 1.4)
+    nokogiri (1.15.4-x86_64-linux)
+      racc (~> 1.4)
     parallel (1.23.0)
     parser (3.2.2.3)
       ast (~> 2.4.1)
diff --git a/lib/obsidian/parser.rb b/lib/obsidian/parser.rb
index d99ec9e..0933a2d 100644
--- a/lib/obsidian/parser.rb
+++ b/lib/obsidian/parser.rb
@@ -26,9 +26,9 @@ def initialize(vault_directory)
       markdown_parser = MarkdownParser.new
 
       vault_directory.glob("**/*").each do |path|
-        dirname, basename = path.relative_path_from(vault_directory).split
+        next if path.directory?
 
-        next if basename == "."
+        dirname, basename = path.relative_path_from(vault_directory).split
 
         # Remove the path component "./" from the start of the dirname
         parent_slug = dirname.to_s.gsub(/\A\.\/?/, "")
@@ -36,7 +36,7 @@ def initialize(vault_directory)
         if basename.to_s.end_with?(".md")
           add_markdown_file(basename: basename, parent_slug: parent_slug, path: path, last_modified: path.mtime, markdown_parser: markdown_parser)
         else
-          add_media_file(basename: basename, parent_slug: parent_slug, last_modified: path.mtime)
+          add_media_file(basename: basename, parent_slug: parent_slug, last_modified: path.mtime, path: path)
         end
       end
 
@@ -67,11 +67,11 @@ def add_markdown_file(basename:, parent_slug:, last_modified:, path:, markdown_p
       )
     end
 
-    def add_media_file(basename:, parent_slug:, last_modified:)
+    def add_media_file(basename:, parent_slug:, last_modified:, path:)
       @media_index.add_page(
         Obsidian.build_slug(basename.to_s, parent_slug),
         last_modified: last_modified,
-        content_type: PretendEverythingIsAnImage.new
+        content_type: ContentType.new(path)
       )
     end
   end
diff --git a/lib/obsidian/parser/content_type.rb b/lib/obsidian/parser/content_type.rb
index 8f2c777..5ef0e7f 100644
--- a/lib/obsidian/parser/content_type.rb
+++ b/lib/obsidian/parser/content_type.rb
@@ -1,5 +1,13 @@
-class PretendEverythingIsAnImage
+require "marcel"
+
+class ContentType
+  def initialize(path)
+    @content_type = Marcel::MimeType.for(path)
+  end
+
   def image?
-    true
+    content_type.start_with?("image/")
   end
+
+  attr_reader :content_type
 end
diff --git a/obsidian-parser.gemspec b/obsidian-parser.gemspec
index 06872f8..5c3687d 100644
--- a/obsidian-parser.gemspec
+++ b/obsidian-parser.gemspec
@@ -31,6 +31,7 @@ Gem::Specification.new do |spec|
   spec.require_paths = ["lib"]
 
   spec.add_dependency "markly", "~> 0.7.0"
+  spec.add_dependency "marcel", "~> 0.3.1"
 
   # For more information and examples about making a new gem, check out our
   # guide at: https://bundler.io/guides/creating_gem.html
diff --git a/spec/example_vault/foo/bar.jpg b/spec/example_vault/foo/bar.jpg
new file mode 100644
index 0000000..5454715
Binary files /dev/null and b/spec/example_vault/foo/bar.jpg differ
diff --git a/spec/obsidian/parser/markdown_parser_spec.rb b/spec/obsidian/parser/markdown_parser_spec.rb
index 40f16cf..fde6aba 100644
--- a/spec/obsidian/parser/markdown_parser_spec.rb
+++ b/spec/obsidian/parser/markdown_parser_spec.rb
@@ -66,7 +66,11 @@
       let(:media_root) { Obsidian::Page.create_root }
 
       before do
-        media_root.add_page("foo/bar.jpg", content_type: PretendEverythingIsAnImage.new)
+        path = Pathname.new(__dir__).join("../../example_vault/foo/bar.jpg")
+        media_root.add_page("foo/bar.jpg", content_type: ContentType.new(path))
+
+        path = Pathname.new(__dir__).join("../../example_vault/hello_world.txt")
+        media_root.add_page("hello_world.txt", content_type: ContentType.new(path))
       end
 
       it "expands image wikilinks" do
@@ -95,6 +99,11 @@
         expect(result).to eq("[bar](/foo/bar)")
       end
 
+      it "falls back to a link if the target is not an image" do
+        result = parser.expand_attachments("![[hello_world.txt]]", root: index, media_root: media_root)
+        expect(result).to eq("[hello_world.txt](/hello_world.txt)")
+      end
+
       it "falls back to plain text if there is no such page" do
         result = parser.expand_attachments("![[banana|a yellow banana]]", root: index, media_root: media_root)
         expect(result).to eq("a yellow banana")