Setting path to root of USB drive

[snappX]

I am trying to find if a file exits in the root of the USB drive:

Folder.SetCurrent(_SourceDrive);
new_exist = File.DoesExist("new.ini");
if new_exist then 
    Dialog.Message("Stop! There is a file already with this name", "You cannot write a file");
else
    Dialog.Message("Are you sure you want to write this file?", "You are about to write a file");
end

The problem I am facing is that navigating to the root of the USB drive (eg: F\ when my AMS 8 application is installed in a sub-folder (eg: F:\NewApplication\) does not work with the _SourceDrive variable. According to the AMS destructions - sorry, instructions - _SourceDrive
The drive that the AutoPlay application was run from (e.g. "C:" or "D:")
While _SourceFolder
The full path to the folder that the AutoPlay application was run from (e.g. "C:\Downloads" or "D:").
In my example above, the script fails to find new.ini in the drive root, but finds it in the sub folder. Thus _SourceFolder and _SourceDrive do the same thing. Is this a USB drive issue?
I have tried setting the path ..\\_SourceDrive but that fails with an error, naturally enough.

How can I set a path below the folder the application is installed in?

[Mick]

Locationt = Folder.Find(_SourceFolder, "Data", false, nil);
Locations = Table.Concat(Locationt, "", 1, TABLE_ALL);
Drives = String.Left(Locations, 2);
result = Dialog.Message("Notice", "" ..Drives.. "", MB_OK, MB_ICONINFORMATION, MB_DEFBUTTON1);

that returns "C:", "data" is a folder in my autoplay root, you could use plugins or whateever

[snappX]

Locationt = Folder.Find(_SourceFolder, "Data", false, nil);
Locations = Table.Concat(Locationt, "", 1, TABLE_ALL);
Drives = String.Left(Locations, 2);
result = Dialog.Message("Notice", "" ..Drives.. "", MB_OK, MB_ICONINFORMATION, MB_DEFBUTTON1);

that returns "C:", "data" is a folder in my autoplay root, you could use plugins or whateever

I'm going to need more help pointers with your code snippet. Whatever I change the folder find "folder" value to, the script errors out with On Click, Line 2: Argument 1 must be of type table.

As I said, it's running from a USB drive with a non-fixed drive letter. I simply (well, it's simple to do it in DOS) want to set the 'current folder' to the root of the drive.

[longedge]

Are you building your application to an .exe or to a folder structure?

If it's an exe then you need to use the _CommandLineArgs to get the drive e.g.

swhere = String.Left(String.Replace(_CommandLineArgs[1], "SFXSOURCE:", "", true), 2);

would give you the drive that the exe is running from.