[Mitchell]

As bubka3 recommended: https://forums.alliedmods.net/showthread.php?p=602270

public ReadFileFolder(String:path[]){
	new Handle:dirh = INVALID_HANDLE;
	new String:buffer[256];
	new String:tmp_path[256];
	new FileType:type = FileType_Unknown;
	new len;
	
	len = strlen(path);
	if (path[len-1] == '\n')
		path[--len] = '\0';

	TrimString(path);
	
	if(DirExists(path)){
		dirh = OpenDirectory(path);
		while(ReadDirEntry(dirh,buffer,sizeof(buffer),type)){
			len = strlen(buffer);
			if (buffer[len-1] == '\n')
				buffer[--len] = '\0';

			TrimString(buffer);

			if (!StrEqual(buffer,"",false) && !StrEqual(buffer,".",false) && !StrEqual(buffer,"..",false)){
				strcopy(tmp_path,255,path);
				StrCat(tmp_path,255,"/");
				StrCat(tmp_path,255,buffer);
				if(type == FileType_File){
					if(downloadtype == 1){
						ReadItem(tmp_path);
					}
					else{
						ReadItemSimple(tmp_path);
					}
				}
				else{
					ReadFileFolder(tmp_path);
				}
			}
		}
	}
	else{
		if(downloadtype == 1){
			ReadItem(path);
		}
		else{
			ReadItemSimple(path);
		}
	}
	if(dirh != INVALID_HANDLE){
		CloseHandle(dirh);
	}
}

Although looping through Directories could make the server lag at times. Cache the results of each file names in the directory.