1) The colon is part of the syntax to access alternate data streams, i.e., it is not an actual part of the file name. In the same way that \ is not a valid char

1) The colon is part of the syntax to access alternate data streams, i.e., it is not an actual part of the file name. In the same way that \ is not a valid character in file names, but it is used to delimit folders. 2) I seriously doubt any game uses alternate data streams for anything.