Problem with boolean .isFile and .isFolder on windows?

@scnils
Does the following code work for you?
My code is not so elegant as the code by @jamshark70,
but it seems to work well at least on my end:

(
~buffers = Dictionary[];
~pathBase = Platform.resourceDir;
PathName(~pathBase).filesDo { |item| 
	var
	folder = item.folderName.asSymbol,
	path = item.fullPath;

	if ("aiff|aif|wav|flac".matchRegexp(item.extension)) {
		if(~buffers.at(folder).isNil) {
			~buffers.put(folder, []);
			("The dictionary key \\" ++ folder + "is added to ~buffers").postln
		};
		~buffers[folder] = ~buffers.at(folder).add(Buffer.read(s, path));
		("The added file to the key \\" ++ folder + "is" + item.fileName).postln;
	}
}
)

Post <<< ~buffers

~buffers[\sounds]
~buffers[\sounds].size
~buffers[\sounds][0].play
~buffers[\sounds][1].play
~buffers[\sounds][2].play

If the subfolders of your main sound folder are only one level deep, the following code might be applicable even though there is no dictionary: