When trying to delete a folder in an external drive/memory stick with Delete operation with elevated rights the installer gives error:

[20052] Operation 'Delete' with arguments: 'd:\tmp\testfolder\' failed: Cannot create backup of d:\tmp\testfolder\: Cannot open d:\tmp\testfolder\ for input

And with Rmdir operation it fails without an error code:

[27824] Operation 'Rmdir' with arguments: 'd:\tmp\testfolder\' failed: Could not remove folder d:\tmp\testfolder\:

Both operations work if the folder is on C: drive. Also a single file can be deleted from an external drive. Giving full access rights to every user doesn't change the outcome.

Tested on Windows 7 with

Component.prototype.createOperations = function() {
    try{
    var dir = "c:\\tmp\\testfolder";
    component.addElevatedOperation("Delete", dir);
    var dir2 = "d:\\tmp\\testfolder";
    component.addElevatedOperation("Delete", dir2);
    }
    catch(e){
    }
}