Upload csv-file bug on Windows

Enonic version: 7.2.0
OS: Windows

Everything works great on Ubuntu.

But when I deploy to the Windows-server I get a bug.

If I upload “users.csv” then getMultipartText() returns null.
But if I rename the file to “users.csv.txt”, it works again.

The frontend form looks like this:

<form
  method="post"
  target="_blank"
  enctype="multipart/form-data"
  data-th-action="${csvServiceUrl}">

  <label for="file">Upload CSV</label>
  <input
    type="file"
    name="file"
    id="file">

  <button type="submit">Upload CSV</button>
</form>