Windows 10 build 19640 updates your PC login logic

Don Sharpe
by Don Sharpe
Don has been writing professionally for over 10 years now, but his passion for the written word started back in his elementary school days. His work has been published on,, eHow,,... Read more
Affiliate Disclosure
  • Windows 10 preview build 19640 is live in the Fast ring.
  • This update improves the Windows login logic.
  • Visit the Windows 10 page for insights that can enhance your mastery of the OS.
  • Would you like to stay up-to-date with the latest prerelease versions of Windows 10? Check out our Windows 10 Insider Build page for updates! 
Windows 10 preview build 19640
To fix various PC problems, we recommend DriverFix:
This software will keep your drivers up and running, thus keeping you safe from common computer errors and hardware failure. Check all your drivers now in 3 easy steps:

  1. Download DriverFix (verified download file).
  2. Click Start Scan to find all problematic drivers.
  3. Click Update Drivers to get new versions and avoid system malfunctionings.
  • DriverFix has been downloaded by 0 readers this month.

The much-anticipated Windows 10 May Update went live just the other day. You can even download it now if you haven’t already. Microsoft isn’t resting though, as the company has just released Windows 10 build 19640.

The latest update is available to Windows insiders in the Fast ring. Apart from that, it brings only two changes.

One is a Downloads folder update, while the other improves your login logic. The build doesn’t bear any fixes.

Windows 10 build 19640 improvements

It appears that insiders had raised concerns about the way Storage Sense deletes files in any Downloads folder synced to a cloud service. According to build 19640 release notes, the disk cleanup tool will no longer offer the option to automatically remove downloaded files from the folder on a cycle.

  • Based on feedback, if your Downloads folder is synced to a cloud provider, we are disabling the option to have Storage Sense automatically clear out your Downloads folder on a cycle.
  • We updated our login logic, so if your PC is set up so you need to type in your username when logging in, accidentally starting your username with a space will no longer result in an error.

Storage Sense is still a work in progress, so it’s good to see Microsoft improving it step by step. The app should succeed the Windows Disk Cleanup tool, which hasn’t been getting a lot of love from the Redmond-based company lately.

On the other hand, the login update is more of a quality of life boost than a mission-critical functional enhancement. It makes sense, though, since anyone can mistype their username by including a space before it.

It seems that, if you make that mistake while signing in, the new authentication logic will quietly remove the space. Obviously, you’ll still get an error if you have a space between any characters in your username!

If you’re a Fast ring insider, have you downloaded Windows 10 build 19640 yet? Feel free let us know how the update pans out in the comments section below.

This article covers:Topics: