The built in Palettes of Mathematica are simply .nb files which can be found in the following place:
SystemOpen@FileNameJoin[{$InstallationDirectory, "SystemFiles", "FrontEnd",
"Palettes"}]
I was trying to open anyone of them but it turned out these files opened directly into the Palettes form.
I tried to open them in the Notepad but (as normal) they opened in the expression form.
I tried to copy the Notepad content into expression cell and convert the cell into display from but it did not work and some errors were generated.
Any idea how to open these files in the normal way so that I can explore the codes of these files?
