How to extract: Download the installer and install to the default folder. Copy all files (except Mp3tagUninstall.exe) to a folder of your choice. Finally, uninstall the application. Launch Mp3tag.exe.
The first time you run it, settings will written to C:\Documents and Settings\[Username]\Application Data\Mp3tag. Shutdown the program and move all setting files to the application folder. When you run the program again, it will read/write the setting files in the application folder.

[Setup]
AppName=mp3tag

[FileToRun]
PathToExe=$Bin$\$AppName$\$AppName$.exe

[Environment]
HOME=$Home$\$AppName$

[Functions]
DirCreate=%HOME%
DirMove=%HOME%\Mp3tag|@AppDataDir@\Mp3tag|o
FileMove=$Bin$\$AppName$\help\mp3tag.lng|$Bin$\$AppName$|o
DirRemove=$Bin$\$AppName$\$PLUGINSDIR
FileDelete=$Bin$\$AppName$\[NSIS].nsi

[RunAfter]
DirMove=@AppDataDir@\Mp3tag|%HOME%\Mp3tag|o

[WriteToReg=$Home$\$AppName$\$AppName$.reg]
MainKey=HKEY_CURRENT_USER\Software\Florian Heidenreich

[RunBefore]
RegEdit=$Home$\$AppName$\$AppName$.reg

[Options]
DeleteTemp=true
MultipleIstances=true
RunWait=true
ShowSplash=false
WriteLog=false

[SplashScreen]
Image=
Title=
TimeOut=1500