Can Unrar Extract EXE Icons Without Full Extraction?

This article examines whether the unrar command-line utility can retrieve an icon embedded within an executable file inside a RAR archive without decompressing the executable itself. The standard unrar tool cannot perform this operation directly because it operates solely at the file-container level rather than parsing internal binary resources. The following sections explain the technical reasons for this limitation and present the standard methods for retrieving executable icons from an archive.

Why Unrar Cannot Extract Binary Icons

The unrar utility is designed to manage compressed file archives. Its internal functionality is limited to reading archive headers, unpacking directory structures, and decompressing raw file byte streams.

An application icon is not stored as an independent file inside a Windows executable (.exe). Instead, it is embedded within the Portable Executable (PE) format, specifically inside the .rsrc (resource) section. To isolate an icon, a utility must:

  1. Parse the PE header.
  2. Locate the resource directory table.
  3. Find the RT_GROUP_ICON and RT_ICON entries.
  4. Convert those entries into an .ico file structure.

Because unrar does not include a PE parser, it treats an .exe file as an opaque sequence of bytes and cannot access internal components like icons, manifests, or version information.

Piping Output as an In-Memory Alternative

While unrar cannot extract the icon by itself, you do not necessarily have to save the full .exe file to your storage drive to access the icon. You can decompress the file directly to standard output (stdout) and pipe the data to a tool capable of parsing PE resources in memory.

Using the print command:

unrar p -inul archive.rar program.exe | your_resource_parser
  • p: Directs unrar to print the decompressed file content to stdout.
  • -inul: Suppresses technical messages and banner text, ensuring the output stream contains only pure binary data.

To extract an icon from an archived executable, use a two-step process:

  1. Extract the file: Extract the specific .exe file using unrar e archive.rar target.exe.
  2. Extract the icon: Use a dedicated resource extractor on the extracted file:
    • Linux: Use wrestool (part of the icoutils package) via wrestool -x -t 14 target.exe -o icon.ico.
    • Windows: Use tools such as Resource Hacker, PowerShell scripts leveraging the .NET System.Drawing.Icon class, or command-line PE extraction tools.
  3. Clean up: Delete the extracted .exe file, leaving only the generated .ico file.