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I use TexnicCenter as an editor for .tex files and .lua files as well. In the file->open dialog box, only certain filetypes are shown by default (e.g. .tex, .sty, .bib etc.). In order to open a .lua file, I need to select All Files from the pulldown menu which is a hassle. Having the menu default to All Files is not a great solution because I then have to sort through the many garbage files that reside in the directory. I have associated .lua files with TexnicCenter, but this does not add them to the menu.

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Is there a way to add custom filetypes to the list of default files so that I don't need to keep doing this? "Use a different editor" is a valid suggestion, but for now I would like to see if this is possible using my current editor.

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The suggestions here might help you: How do I view only specific extension types in Outlook's "attach file" explorer window? –  Karan May 8 '13 at 14:21
    
While this is usually compiled into the application, I think there are tools that allow you to manipulate GUI elements on-the-fly. However, some of these tools rely on code injection, which may require administrator/root privileges. Alternatively, you could modify the compiled binary itself in hopes of fixing the file filter (they are just stored as plain-text strings). –  Breakthrough May 8 '13 at 20:57
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This is controlled by the application. In code the application seeds the drop-down list and specifies the default. You would need to submit a feature request to the product developer to change this behavior.

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Ok, thanks. I sort of figured so, but thought there may have been something in the registry that could make it happen. –  Scott H. May 6 '13 at 20:26
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More than likely not. The pull downs are generally hard coded in the software and unless it provides a method for it add those file types I do not believe it is possible.

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