diff --git a/atom/browser/net/asar/url_request_asar_job.cc b/atom/browser/net/asar/url_request_asar_job.cc
index a2ebd04c87..a4875a145f 100644
--- a/atom/browser/net/asar/url_request_asar_job.cc
+++ b/atom/browser/net/asar/url_request_asar_job.cc
@@ -4,6 +4,10 @@
 
 #include "atom/browser/net/asar/url_request_asar_job.h"
 
+#include <string>
+
+#include "net/base/file_stream.h"
+#include "net/base/io_buffer.h"
 #include "net/base/mime_util.h"
 #include "net/base/net_errors.h"
 #include "net/url_request/url_request_status.h"
@@ -19,20 +23,30 @@ URLRequestAsarJob::URLRequestAsarJob(
     : net::URLRequestJob(request, network_delegate),
       archive_(asar_path),
       file_path_(file_path),
+      stream_(new net::FileStream(file_task_runner)),
+      remaining_bytes_(0),
       file_task_runner_(file_task_runner),
       weak_ptr_factory_(this) {}
 
 URLRequestAsarJob::~URLRequestAsarJob() {}
 
 void URLRequestAsarJob::Start() {
-  Archive::FileInfo info;
-  if (!archive_.Init() || !archive_.GetFileInfo(file_path_, &info)) {
+  if (!archive_.Init() || !archive_.GetFileInfo(file_path_, &file_info_)) {
     NotifyDone(net::URLRequestStatus(net::URLRequestStatus::FAILED,
                                      net::ERR_FILE_NOT_FOUND));
     return;
   }
 
-  NotifyHeadersComplete();
+  remaining_bytes_ = static_cast<int64>(file_info_.size);
+
+  int flags = base::File::FLAG_OPEN |
+              base::File::FLAG_READ |
+              base::File::FLAG_ASYNC;
+  int rv = stream_->Open(archive_.path(), flags,
+                         base::Bind(&URLRequestAsarJob::DidOpen,
+                                    weak_ptr_factory_.GetWeakPtr()));
+  if (rv != net::ERR_IO_PENDING)
+    DidOpen(rv);
 }
 
 void URLRequestAsarJob::Kill() {
@@ -40,15 +54,89 @@ void URLRequestAsarJob::Kill() {
   URLRequestJob::Kill();
 }
 
-bool URLRequestAsarJob::ReadRawData(net::IOBuffer* buf,
-                                    int buf_size,
+bool URLRequestAsarJob::ReadRawData(net::IOBuffer* dest,
+                                    int dest_size,
                                     int* bytes_read) {
-  *bytes_read = 0;
-  return true;
+  if (remaining_bytes_ < dest_size)
+    dest_size = static_cast<int>(remaining_bytes_);
+
+  // If we should copy zero bytes because |remaining_bytes_| is zero, short
+  // circuit here.
+  if (!dest_size) {
+    *bytes_read = 0;
+    return true;
+  }
+
+  int rv = stream_->Read(dest,
+                         dest_size,
+                         base::Bind(&URLRequestAsarJob::DidRead,
+                                    weak_ptr_factory_.GetWeakPtr(),
+                                    make_scoped_refptr(dest)));
+  if (rv >= 0) {
+    // Data is immediately available.
+    *bytes_read = rv;
+    remaining_bytes_ -= rv;
+    DCHECK_GE(remaining_bytes_, 0);
+    return true;
+  }
+
+  // Otherwise, a read error occured.  We may just need to wait...
+  if (rv == net::ERR_IO_PENDING) {
+    SetStatus(net::URLRequestStatus(net::URLRequestStatus::IO_PENDING, 0));
+  } else {
+    NotifyDone(net::URLRequestStatus(net::URLRequestStatus::FAILED, rv));
+  }
+  return false;
 }
 
 bool URLRequestAsarJob::GetMimeType(std::string* mime_type) const {
   return net::GetMimeTypeFromFile(file_path_, mime_type);
 }
 
+void URLRequestAsarJob::DidOpen(int result) {
+  if (result != net::OK) {
+    NotifyDone(net::URLRequestStatus(net::URLRequestStatus::FAILED, result));
+    return;
+  }
+
+  int rv = stream_->Seek(net::FROM_BEGIN,
+                         file_info_.offset,
+                         base::Bind(&URLRequestAsarJob::DidSeek,
+                                    weak_ptr_factory_.GetWeakPtr()));
+  if (rv != net::ERR_IO_PENDING) {
+    // stream_->Seek() failed, so pass an intentionally erroneous value
+    // into DidSeek().
+    DidSeek(-1);
+  }
+}
+
+void URLRequestAsarJob::DidSeek(int64 result) {
+  if (result != static_cast<int64>(file_info_.offset)) {
+    NotifyDone(net::URLRequestStatus(net::URLRequestStatus::FAILED,
+                                     net::ERR_REQUEST_RANGE_NOT_SATISFIABLE));
+    return;
+  }
+
+  set_expected_content_size(remaining_bytes_);
+  NotifyHeadersComplete();
+}
+
+void URLRequestAsarJob::DidRead(scoped_refptr<net::IOBuffer> buf, int result) {
+  if (result > 0) {
+    SetStatus(net::URLRequestStatus());  // Clear the IO_PENDING status
+    remaining_bytes_ -= result;
+    DCHECK_GE(remaining_bytes_, 0);
+  }
+
+  buf = NULL;
+
+  if (result == 0) {
+    NotifyDone(net::URLRequestStatus());
+  } else if (result < 0) {
+    NotifyDone(net::URLRequestStatus(net::URLRequestStatus::FAILED, result));
+  }
+
+  NotifyReadComplete(result);
+}
+
 }  // namespace asar
diff --git a/atom/browser/net/asar/url_request_asar_job.h b/atom/browser/net/asar/url_request_asar_job.h
index 75653f282f..b85aa3c6f4 100644
--- a/atom/browser/net/asar/url_request_asar_job.h
+++ b/atom/browser/net/asar/url_request_asar_job.h
@@ -5,6 +5,8 @@
 #ifndef ATOM_BROWSER_NET_ASAR_URL_REQUEST_ASAR_JOB_H_
 #define ATOM_BROWSER_NET_ASAR_URL_REQUEST_ASAR_JOB_H_
 
+#include <string>
+
 #include "atom/common/asar/archive.h"
 #include "base/files/file_path.h"
 #include "base/memory/ref_counted.h"
@@ -15,6 +17,10 @@ namespace base {
 class TaskRunner;
 }
 
+namespace net {
+class FileStream;
+}
+
 namespace asar {
 
 class URLRequestAsarJob : public net::URLRequestJob {
@@ -37,8 +43,22 @@ class URLRequestAsarJob : public net::URLRequestJob {
   virtual ~URLRequestAsarJob();
 
  private:
+  // Callback after opening file on a background thread.
+  void DidOpen(int result);
+
+  // Callback after seeking to the beginning of |byte_range_| in the file
+  // on a background thread.
+  void DidSeek(int64 result);
+
+  // Callback after data is asynchronously read from the file into |buf|.
+  void DidRead(scoped_refptr<net::IOBuffer> buf, int result);
+
   Archive archive_;
+  Archive::FileInfo file_info_;
   base::FilePath file_path_;
+
+  scoped_ptr<net::FileStream> stream_;
+  int64 remaining_bytes_;
   const scoped_refptr<base::TaskRunner> file_task_runner_;
 
   base::WeakPtrFactory<URLRequestAsarJob> weak_ptr_factory_;
diff --git a/atom/common/asar/archive.cc b/atom/common/asar/archive.cc
index 28116d6990..a518230461 100644
--- a/atom/common/asar/archive.cc
+++ b/atom/common/asar/archive.cc
@@ -44,7 +44,9 @@ bool GetNodeFromPath(std::string path,
 
 }  // namespace
 
-Archive::Archive(const base::FilePath& path) : path_(path) {
+Archive::Archive(const base::FilePath& path)
+    : path_(path),
+      header_size_(0) {
 }
 
 Archive::~Archive() {
@@ -94,6 +96,7 @@ bool Archive::Init() {
     return false;
   }
 
+  header_size_ = 8 + size;
   header_.reset(static_cast<base::DictionaryValue*>(value));
   return true;
 }
@@ -119,8 +122,9 @@ bool Archive::GetFileInfo(const base::FilePath& path, FileInfo* info) {
   int size;
   if (!node->GetInteger("size", &size))
     return false;
-  info->size = static_cast<uint32>(size);
 
+  info->offset += header_size_;
+  info->size = static_cast<uint32>(size);
   return true;
 }
 
diff --git a/atom/common/asar/archive.h b/atom/common/asar/archive.h
index ef11eadf40..c4cde803bf 100644
--- a/atom/common/asar/archive.h
+++ b/atom/common/asar/archive.h
@@ -34,6 +34,7 @@ class Archive {
 
  private:
   base::FilePath path_;
+  uint32 header_size_;
   scoped_ptr<base::DictionaryValue> header_;
 
   DISALLOW_COPY_AND_ASSIGN(Archive);