Comment 3 for bug 579334

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The load file facility should either by default provide filetypes for common file extensions (*.asm, *.s) or at least also offer to display ALL files in a given directory.

There's another issue that novice user probably encounter frequently:
while stepping through source code, the editor area is rightly set readonly, however this isn't really visible or communicated in any way - it would be better visualized by also changing its background color accordingly (i.e. grey out), and optionally even displaying an information box when the user tries to edit source code while it is still being run by the simulator.