Steamworks creates "steam_appid.txt" if modules are not packed into exe

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    I have a Steamworks object in my application. It has the "Write AppId" option disabled.

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    If I build the game with the option "Do not pack DLLs and modules into .exe", then the "steam_appid.txt" file will be created when the game is launched, regardless of the extension option.

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    To simplify the usage, the behavior of this extension is not standard.

    According to valve's document, steam_appid.txt only should be created when you want to debug locally (or boot check by SteamAPI_Init will fail). When launch game from steam, the appid is passed by client and no longer need this file, or to say shouldn't create this file.

    To enable overlay, steam needs to hook D3D, aka init when extension dll is loaded, however, in this stage nothing in mfa is loaded, so object properties is not accessible, this extension write appid data to the about info of application, and read it then create it here (so, may also because conflict with other steamAPI objects, e.g., in frame one and in frame two). Without unpacked exe this file is also created, but in the temp folder where mmf extract dlls. I'm not sure what it did to achieve this but it should be something like changing working directory. It's okay to ignore this.

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