The following text was taken from the original author Pegasy

Introduction

This is an unofficial port of the game Touhou Kaikidan: Mystic Square (the fifth game of the touhou series, referred to as th05 below) to windows. It faithfully reproduces almost all features of the original PC98 version. Check "Comparison" section for the details

Usage

Extract all files into a folder.
Download glew from http://glew.sourceforge.net/ (download the binaries) and extract glew32.dll into the same folder.
Download PMDWin from http://c60.fmp.jp/ and extract PMDWin.dll into the same folder.
(Optional) Put anex86.bmp into the same foldeer. (google it to find out how to get this file)
Put 怪綺談1.dat, 怪綺談2.dat and ZUN.com from the orignal PC98 version into the same folder (these files may have different names depending on you system's code page, for example, 夦鉟択1.dat in chinese code page) 5.1 If you only have an .hdi file that contains the original game, you can: 5.1.1 Download anex86 (google it to find the download link) 5.1.2 Use anxdiet that is included in anex86 to open the .hdi file 5.1.3 Drag the three need files to the destination folder
Rename 怪綺談1.dat to kaiki1.dat, 怪綺談2.dat to kaiki2.dat.
Run uth05win.exe.

To start the game without translation, open config.ini and comment the line with "MOD_FILE = chs.dat"

Comparison

New features in this ported version:

replay support
translated into chinese (can be turned off)
fixed a number of bugs in the PC98 version
uses float instead of int where necessary, increasing accuracy

Features not ported in this version:

Music room
demo play
staff roll
player performance evaluation
some options

Controls

Similar to other games of touhou series: Z Shoot X Bomb Shift Slow move Ctrl skip dialog ESC Menu

To toggle fullscreen mode, press alt + enter.

Game pad is not supported.

Known bugs

When you switch to/from full screen mode, the font texture may become corrupted.

Copyright

1999 Team Shanghai Alice 2011 Pegasy This program is in the public domain.

The assets and libraries it uses belongs to their authors. Check their webpage for copyright information

This program uses:

assets from th05 (http://www.kt.rim.or.jp/~aotaka/am/index.htm)
The OpenGL Extension Wrangler Library (http://glew.sourceforge.net/)
PMDWin (http://c60.fmp.jp/)

Misc

For bug report and feature request, please contact the one you received this program from:)