Github user twogee commented on the issue:
https://github.com/apache/ant-ivy/pull/20
I can assure you that colon in version has NEVER have worked on Windows.
Test case
```
import java.io.*;
public class TestColonNTFS {
public static void main(String[] args) throws IOException {
try (Writer writer = new BufferedWriter(new OutputStreamWriter(new
FileOutputStream("file:name.txt"), "utf-8"))) {
writer.write("something");
}
}
}
```
produces
```
>dir
...
2017-05-20 20:39 0 file
...
>dir /r file
...
2017-05-20 20:39 0 file
9 file:name.txt:$DATA
```
And that is the correct behaviour of NTFS: create an [alternate data
stream](https://msdn.microsoft.com/en-us/library/windows/desktop/aa364404). You
can use that for versioning, for sure ;-) But this is not portable.
Now, should we introduce a special treatment for reserved and unsafe URL
characters, we will create a lock-in unless all other tools accept the same
conventions, which is unlikely. And that defeats the very idea of flexibility.
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