Initial release

.gitignore

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+## Ignore Visual Studio temporary files, build results, and
+## files generated by popular Visual Studio add-ons.
+
+# User-specific files
+*.suo
+*.user
+*.userosscache
+*.sln.docstates
+
+# User-specific files (MonoDevelop/Xamarin Studio)
+*.userprefs
+
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+[Dd]ebugPublic/
+[Rr]elease/
+[Rr]eleases/
+x64/
+x86/
+bld/
+[Bb]in/
+[Oo]bj/
+[Ll]og/
+
+# Visual Studio 2015 cache/options directory
+.vs/
+# Uncomment if you have tasks that create the project's static files in wwwroot
+#wwwroot/
+
+# MSTest test Results
+[Tt]est[Rr]esult*/
+[Bb]uild[Ll]og.*
+
+# NUNIT
+*.VisualState.xml
+TestResult.xml
+
+# Build Results of an ATL Project
+[Dd]ebugPS/
+[Rr]eleasePS/
+dlldata.c
+
+# DNX
+project.lock.json
+artifacts/
+
+*_i.c
+*_p.c
+*_i.h
+*.ilk
+*.meta
+*.obj
+*.pch
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+*.pgd
+*.rsp
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+ipch/
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+# Visual Studio profiler
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+*.sap
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+$tf/
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+# NCrunch
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+# MightyMoose
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+# Web workbench (sass)
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+DocProject/Help/*.hhk
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+
+# Click-Once directory
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+
+# Publish Web Output
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+# TODO: Comment the next line if you want to checkin your web deploy settings
+# but database connection strings (with potential passwords) will be unencrypted
+*.pubxml
+*.publishproj
+
+# Microsoft Azure Web App publish settings. Comment the next line if you want to
+# checkin your Azure Web App publish settings, but sensitive information contained
+# in these scripts will be unencrypted
+PublishScripts/
+
+# NuGet Packages
+*.nupkg
+# The packages folder can be ignored because of Package Restore
+**/packages/*
+# except build/, which is used as an MSBuild target.
+!**/packages/build/
+# Uncomment if necessary however generally it will be regenerated when needed
+#!**/packages/repositories.config
+# NuGet v3's project.json files produces more ignoreable files
+*.nuget.props
+*.nuget.targets
+
+# Microsoft Azure Build Output
+csx/
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+# Microsoft Azure Emulator
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+# Others
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+# Since there are multiple workflows, uncomment next line to ignore bower_components
+# (https://github.com/github/gitignore/pull/1529#issuecomment-104372622)
+#bower_components/
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+# RIA/Silverlight projects
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+# to a newer Visual Studio version. Backup files are not needed,
+# because we have git ;-)
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+Backup*/
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+# Paket dependency manager
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+paket-files/
+
+# FAKE - F# Make
+.fake/
+
+# JetBrains Rider
+.idea/
+*.sln.iml

LICENSE

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+MIT License
+
+Copyright (c) 2016 Ryan Davis
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

README.md

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+# sg-unpack
+Unpacker for STEINS;GATE .mpk content files.
+
+Tested with content files from the Steam edition of STEINS;GATE with the [Steam Improvement Patch](http://sonome.dareno.me/projects/sghd.html) applied. Other configurations might also work, as well as other games by the same publisher using the .mpk format, but these are untested.
+
+### Downloading
+Check the [releases](https://github.com/rdavisau/sg-unpack/releases) page for the latest version.
+
+### Usage
+`sg-unpack` is a command line tool that takes one or many .mpk inputs and extracts the content to a given output directory.
+
+```
+sg-unpack 1.0.0.0
+Copyright © Ryan Davis 2017
+
+  -i, --input-path       Required. Path to input/s. Can be an individual file, or a directory.
+
+  -m, --input-mask       (Default: *.mpk) Search mask for --input-path, used if --input-path is a directory.
+
+  -o, --output-path      Output path for extracted files. If ommitted, contents will be listed but not extracted.
+
+  -f, --output-filter    Case-insensitive filter for files to extract.
+
+  -q, --quiet            (Default: false) Set true to hide most output.
+
+  --help                 Display this help screen.
+
+  --version              Display version information.
+```
+
+### Examples
+
+#### List the files in the `bgm.mpk` pack by omitting the `output-path`:
+
+###### Command
+`sg-unpack.exe -i C:\Program Files (x86)\Steam\steamapps\common\STEINS;GATE\USRDIR\bgm.mpk`
+
+###### Output
+```
+Using inputs [ bgm.mpk ] in C:\Program Files (x86)\Steam\steamapps\common\STEINS;GATE.
+
+Scanning 1 inputs...
+Processing 83 entries...
+bgmBGM03.ogg      ~4.87 MB
+bgmBGM04.ogg      ~3.49 MB
+         * snip *
+bgmBGM999.ogg     ~2.53 MB
+bgmSONG1.ogg      ~2.45 MB
+
+83 entries found in 1 pack.
+No files extracted. Use --output-path to specify an output directory.
+```
+
+#### Use output filter to extract all audio files (`.ogg`) from the mpk files in the content directory to `C:\SG`, without listing the processed files (`-q true`):
+
+###### Command
+`sg-unpack.exe -i C:\Program Files (x86)\Steam\steamapps\common\STEINS;GATE\USRDIR -f .ogg -o C:\SG -q true`
+
+###### Output
+```
+Using inputs [ bg.mpk, bgm.mpk, chara.mpk, manual.mpk, mask.mpk, mgsshader.mpk, script.mpk, se.mpk, shader.mpk, system.mpk, voice.mpk ] in C:\Program Files (x86)\Steam\steamapps\common\STEINS;GATE.
+
+Scanning 11 inputs...
+Processing 16,096 entries matching on filter '.ogg'...
+
+14,794 files (1.79 GB) extracted to 'C:\SG' in 00:00:07.7275492.
+```
+
+#### Extract All The Things:
+
+###### Command
+`sg-unpack.exe -i C:\Program Files (x86)\Steam\steamapps\common\STEINS;GATE\USRDIR -o C:\SG`
+
+###### Output
+```
+Using inputs [ bg.mpk, bgm.mpk, chara.mpk, manual.mpk, mask.mpk, mgsshader.mpk, script.mpk, se.mpk, shader.mpk, system.mpk, voice.mpk ] in C:\Program Files (x86)\Steam\steamapps\common\STEINS;GATE.
+
+Scanning 11 inputs...
+Processing 16,096 entries...
+
+* snip sixteen thousand lines *
+
+16,096 files (3.31 GB) extracted to 'C:\SG' in 00:00:12.2559171.
+```
+
+### Issues
+Error handling is minimal to non-existent :smile: If you have any problems, open an issue and depending on the nature of the error I might take a look. That said, I wrote this on the request of a friend so it's mostly provided here on an 'as-is' basis :shipit:

sg-unpack.sln

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+
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio 15
+VisualStudioVersion = 15.0.26014.0
+MinimumVisualStudioVersion = 10.0.40219.1
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "sg-unpack", "sg-unpack\sg-unpack.csproj", "{8C4DC592-2429-48C4-8C78-FDD33AE303A0}"
+EndProject
+Project("{2150E333-8FDC-42A3-9474-1A3956D46DE8}") = "Solution Items", "Solution Items", "{3C945479-8A26-4D01-B645-8A4287041AC7}"
+	ProjectSection(SolutionItems) = preProject
+		README.md = README.md
+	EndProjectSection
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|Any CPU = Debug|Any CPU
+		Release|Any CPU = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{8C4DC592-2429-48C4-8C78-FDD33AE303A0}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{8C4DC592-2429-48C4-8C78-FDD33AE303A0}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{8C4DC592-2429-48C4-8C78-FDD33AE303A0}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{8C4DC592-2429-48C4-8C78-FDD33AE303A0}.Release|Any CPU.Build.0 = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(SolutionProperties) = preSolution
+		HideSolutionNode = FALSE
+	EndGlobalSection
+EndGlobal

sg-unpack/App.config

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+<?xml version="1.0" encoding="utf-8" ?>
+<configuration>
+    <startup> 
+        <supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.5.2" />
+    </startup>
+</configuration>