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SPECIFICTION
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Lunar IPS

fusoya.eludevisibility.org

Windows
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Spec score 7.0 #15 of 20 in ROM Patching Software

What it is

Lunar IPS is a free Windows utility for creating and applying IPS patches, intended as a lightweight replacement for the SNESTool DOS program. It supports full run-length encoding and decoding, and can expand or truncate files. Its encoder produces IPS files no larger than those created with SNESTool and avoids the rare 0x454F46 EOF offset issue attributed to SNESTool’s encoder. Applying a patch can generate a ROMFileName.log file. Lunar IPS can register the .IPS file type in Windows, allowing a patch to be opened by double-clicking and then associated with a file to modify. IPS patching supports files up to 16 MB because the format uses 24-bit addressing, although an IPS file itself can be any size. Logging and file-registration settings are stored in the Windows registry. Version 1.03 is listed, updated February 2, 2022. The archive is 172K zipped or 437K unzipped, with command-line support and several listed language versions.

Spec sheet

Purpose
Lunar IPS is a lightweight Windows utility intended to replace the SNESTool DOS program.Read 5 Oct 2026 · fusoya.eludevisibility.org
Founded
2000Read 23 Oct 2026 · fusoya.eludevisibility.org
Current listed release
The page lists version 1.03, updated February 2, 2022.Read 5 Oct 2026 · fusoya.eludevisibility.org
Download size
The listed archive size is 172K zipped and 437K unzipped.Read 5 Oct 2026 · fusoya.eludevisibility.org
Encoder behavior
Its encoder avoids the rare 0x454F46 (EOF) offset bug attributed to SNESTool's IPS encoder.Read 5 Oct 2026 · fusoya.eludevisibility.org
Encoder output
Its IPS encoder creates files the same size as or smaller than files created with SNESTool.Read 5 Oct 2026 · fusoya.eludevisibility.org
Encoding
It supports full RLE encoding and decoding.Read 5 Oct 2026 · fusoya.eludevisibility.org
File association
The utility can register the .IPS file type so users can double-click an IPS file and choose a file to patch.Read 5 Oct 2026 · fusoya.eludevisibility.org
File handling
It supports expanding and truncating files.Read 5 Oct 2026 · fusoya.eludevisibility.org
File sizing
It supports expanding and truncating files.Read 5 Oct 2026 · fusoya.eludevisibility.org
Logging
Applying a patch can generate a log named ROMFileName.log.Read 5 Oct 2026 · fusoya.eludevisibility.org
Minimum Windows versions
The listed minimum operating systems are Windows 95 for 32-bit and Windows XP 64-bit for 64-bit.Read 5 Oct 2026 · fusoya.eludevisibility.org
Operating system requirements
The listed minimum operating systems are Windows 95 (32-bit) and Windows XP 64-bit.Read 5 Oct 2026 · fusoya.eludevisibility.org
Other languages
The page lists Croatian, Dutch, German, Brazilian Portuguese, Spanish, and Swedish versions.Read 5 Oct 2026 · fusoya.eludevisibility.org
Patch operations
It can create and apply IPS patches.Read 5 Oct 2026 · fusoya.eludevisibility.org
Patch output
The IPS encoder creates files the same size as or smaller than files created with SNESTool.Read 5 Oct 2026 · fusoya.eludevisibility.org
Patch size limit
IPS patching is supported for files up to 16 MB; the IPS format cannot record changes beyond that mark because it uses 24-bit addressing, though an IPS file itself can be any size.Read 5 Oct 2026 · fusoya.eludevisibility.org
Settings storage
The logging and file registration options are saved to the Windows registry.Read 5 Oct 2026 · fusoya.eludevisibility.org
Translations
The page lists Croatian, Dutch, German, Brazilian Portuguese, Spanish, and Swedish language versions.Read 5 Oct 2026 · fusoya.eludevisibility.org
Version and update
The listed version is 1.03, updated February 2, 2022.Read 5 Oct 2026 · fusoya.eludevisibility.org

Strong points and limits

Strong points

  • Free Windows utility
  • Creates and applies IPS patches
  • Full RLE encoding and decoding
  • Command-line support available
  • Registers .IPS files in Windows

Limits

  • IPS changes are limited to 16 MB
  • Minimum systems include older Windows releases
  • Settings are stored in the Windows registry

Who it suits

Lunar IPS suits Windows users who need command-line or graphical IPS patch creation and application. It is relevant for users working within the format’s 16 MB patching limit.

Verdict

Lunar IPS provides focused IPS patch creation and application on Windows, with file sizing tools, logging, and file association. Its principal constraint is the IPS format’s 16 MB change limit.

Where Specifiction places it

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