diff --git a/include/dwarfs/file_access.h b/include/dwarfs/file_access.h
index 9dd002ca..f1a0b14c 100644
--- a/include/dwarfs/file_access.h
+++ b/include/dwarfs/file_access.h
@@ -49,11 +49,20 @@ class file_access {
   virtual ~file_access() = default;
 
   virtual bool exists(std::filesystem::path const& path) const = 0;
+
+  virtual std::unique_ptr<input_stream>
+  open_input(std::filesystem::path const& path) const = 0;
   virtual std::unique_ptr<input_stream>
   open_input(std::filesystem::path const& path, std::error_code& ec) const = 0;
+
+  virtual std::unique_ptr<input_stream>
+  open_input_binary(std::filesystem::path const& path) const = 0;
   virtual std::unique_ptr<input_stream>
   open_input_binary(std::filesystem::path const& path,
                     std::error_code& ec) const = 0;
+
+  virtual std::unique_ptr<output_stream>
+  open_output_binary(std::filesystem::path const& path) const = 0;
   virtual std::unique_ptr<output_stream>
   open_output_binary(std::filesystem::path const& path,
                      std::error_code& ec) const = 0;
diff --git a/src/dwarfs/file_access_generic.cpp b/src/dwarfs/file_access_generic.cpp
index db5106b7..68803170 100644
--- a/src/dwarfs/file_access_generic.cpp
+++ b/src/dwarfs/file_access_generic.cpp
@@ -23,6 +23,8 @@
 #include <filesystem>
 #include <fstream>
 
+#include <fmt/format.h>
+
 #ifdef _WIN32
 #include <folly/portability/Windows.h>
 #endif
@@ -103,6 +105,17 @@ class file_access_generic : public file_access {
     return rv;
   }
 
+  std::unique_ptr<input_stream>
+  open_input(std::filesystem::path const& path) const override {
+    std::error_code ec;
+    auto rv = open_input(path, ec);
+    if (ec) {
+      throw std::system_error(ec,
+                              fmt::format("open_input('{}')", path.string()));
+    }
+    return rv;
+  }
+
   std::unique_ptr<input_stream>
   open_input_binary(std::filesystem::path const& path,
                     std::error_code& ec) const override {
@@ -113,6 +126,17 @@ class file_access_generic : public file_access {
     return rv;
   }
 
+  std::unique_ptr<input_stream>
+  open_input_binary(std::filesystem::path const& path) const override {
+    std::error_code ec;
+    auto rv = open_input_binary(path, ec);
+    if (ec) {
+      throw std::system_error(
+          ec, fmt::format("open_input_binary('{}')", path.string()));
+    }
+    return rv;
+  }
+
   std::unique_ptr<output_stream>
   open_output_binary(std::filesystem::path const& path,
                      std::error_code& ec) const override {
@@ -122,6 +146,17 @@ class file_access_generic : public file_access {
     }
     return rv;
   }
+
+  std::unique_ptr<output_stream>
+  open_output_binary(std::filesystem::path const& path) const override {
+    std::error_code ec;
+    auto rv = open_output_binary(path, ec);
+    if (ec) {
+      throw std::system_error(
+          ec, fmt::format("open_output_binary('{}')", path.string()));
+    }
+    return rv;
+  }
 };
 
 } // namespace
diff --git a/test/test_helpers.h b/test/test_helpers.h
index 92e7de54..30cfb993 100644
--- a/test/test_helpers.h
+++ b/test/test_helpers.h
@@ -168,14 +168,23 @@ class test_terminal : public terminal {
 class test_file_access : public file_access {
  public:
   bool exists(std::filesystem::path const& path) const override;
+
   std::unique_ptr<input_stream> open_input(std::filesystem::path const& path,
                                            std::error_code& ec) const override;
+  std::unique_ptr<input_stream>
+  open_input(std::filesystem::path const& path) const override;
+
   std::unique_ptr<input_stream>
   open_input_binary(std::filesystem::path const& path,
                     std::error_code& ec) const override;
+  std::unique_ptr<input_stream>
+  open_input_binary(std::filesystem::path const& path) const override;
+
   std::unique_ptr<output_stream>
   open_output_binary(std::filesystem::path const& path,
                      std::error_code& ec) const override;
+  std::unique_ptr<output_stream>
+  open_output_binary(std::filesystem::path const& path) const override;
 
   void set_file(std::filesystem::path const& path, std::string contents) const;
   std::optional<std::string> get_file(std::filesystem::path const& path) const;
diff --git a/test/test_iolayer.cpp b/test/test_iolayer.cpp
index 4f59d046..fda8b0db 100644
--- a/test/test_iolayer.cpp
+++ b/test/test_iolayer.cpp
@@ -84,12 +84,33 @@ test_file_access::open_input(std::filesystem::path const& path,
   return nullptr;
 }
 
+std::unique_ptr<input_stream>
+test_file_access::open_input(std::filesystem::path const& path) const {
+  std::error_code ec;
+  auto rv = open_input(path, ec);
+  if (ec) {
+    throw std::system_error(ec, fmt::format("open_input('{}')", path.string()));
+  }
+  return rv;
+}
+
 std::unique_ptr<input_stream>
 test_file_access::open_input_binary(std::filesystem::path const& path,
                                     std::error_code& ec) const {
   return open_input(path, ec);
 }
 
+std::unique_ptr<input_stream>
+test_file_access::open_input_binary(std::filesystem::path const& path) const {
+  std::error_code ec;
+  auto rv = open_input_binary(path, ec);
+  if (ec) {
+    throw std::system_error(
+        ec, fmt::format("open_input_binary('{}')", path.string()));
+  }
+  return rv;
+}
+
 std::unique_ptr<output_stream>
 test_file_access::open_output_binary(std::filesystem::path const& path,
                                      std::error_code& ec) const {
@@ -100,6 +121,17 @@ test_file_access::open_output_binary(std::filesystem::path const& path,
   return rv;
 }
 
+std::unique_ptr<output_stream>
+test_file_access::open_output_binary(std::filesystem::path const& path) const {
+  std::error_code ec;
+  auto rv = open_output_binary(path, ec);
+  if (ec) {
+    throw std::system_error(
+        ec, fmt::format("open_output_binary('{}')", path.string()));
+  }
+  return rv;
+}
+
 void test_file_access::set_file(std::filesystem::path const& path,
                                 std::string content) const {
   files_[path] = std::move(content);