Hi, back from vacation, and ready to help (at least I hope so)!
First if all: The Mac tries to be "user friendly" (as always), which all too often has the exact opposite effect (as always

).
In this case, it's this problem:
For me it seems like there are no directories for version 4.3.8.2. It seems like this only is an direct app (the “green diamond” logo)
That's true, if you use the Mac's graphical file browser (the "Finder") -- but the "direct app" (the one with the "green emerald" icon) is nothing else than a simple, stupid directory (folder) that contains all files for the application, with the "little" difference that it is displayed in the Finder just like an executable file (which it is not). You can start the game by double-clicking that icon. And you can browse that folder by pressing the right mouse button on that icon, opening the context menu and selecting the second entry from the top (which should be something like "Show package content" or something similar).
When using a shell ("Terminal" program on the Mac), game graphics can be found in the following directory (as written in my very first post in this thread):
- Rocks'n'Diamonds.app/Contents/Resources/graphics/gfx_classic/RocksHeroes.png
Regarding PCX and PNG files: Since I added PNG support, both PCX and PNG graphics are supported for all versions and all platforms. Especially, you can explicitly specify graphics files like "foo.pcx" or "bar.png" in your "graphicsinfo.conf", and the game will always also look for "foo.png" and "bar.pcx" if it cannot find the file as specified.
But to replace some original graphic files with your own, you don't need to replace graphics in the game's "application bundle" directory -- just use the described "elegant" way to add your own graphics set (and configure to use that graphics set in the setup menu, as described above), but make sure that the graphics file name to be replaced is the same as in the original graphics set (while PCX or PNG does not matter). Then your own version of the graphics file should be preferred over the original graphics file.
Hope that helps!
