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game.ios can be found in the OS X version by browsing into the Undertale application using "Show Package Contents". cab containing all the game's resources along with the real executable, which can be run normally from wherever you extract the files to. In the Windows 1.00 version, data.win can be extracted from UNDERTALE.exe with any decent archiving tool like 7-Zip or WinRAR. This works for almost all versions of Undertale. The easier way to enable/disable Debug Mode is to download UndertaleModTool, open the data file mentioned above with it, and run the EnableDebug bulitin script.
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