Pretty sure this has to do with Windows 10's new sort order. You can change this in the group policies of Windows.
Numerical sorting in File Explorer is enabled by default in Windows 10. When numerical sorting is enabled, File Explorer will sort file names by increasing number value (for example, 3 < 22 < 111).
When numerical sorting is disabled, File Explorer will sort file names by each digit in a file name (for example, 111 < 22 < 3).

I have a German Windows installation, but you can easily find instructions on the web for the US version to change this behavior. Just google "Windows 10 explorer sort alphanumerical".


Biab/RB latest build, German Language Pak, Win 10/64 Pro, 1 TB SSD, 32 GB RAM. Notation SW Finale, StaffPad, SmartsScore – Playing Double Bass, Guitar, Piano