Dynamic themes

Hi I have had this software for a long time and I would save pictures that I like. Recently some other pictures have been found on my computer in the same folder. The file names all start with lock2023-b45_wl_ or lock2023-b45_wl_ or lock2025-b59_wl. So waht are these jpgs called lock and how did I end up with them. I have gone to the app but I don't see any settings for this. Anyone used this application. It is nice to have diffrent pictures each day and I can use some nice ones if I want.

I do have a screen at boot up when I enter a password but this is fixed by me and dosn't change from day to day. I change this picture sometimes when I am boared with the old one.

They are lock / working files used by the app’s wallpaper download/cache system.

Dynamic Theme pulls images (typically from Windows Spotlight and Bing), and these files are used to:

• prevent simultaneous writes while downloading images
• track in-progress or cached wallpaper updates
• maintain internal state for the image pipeline

Why the naming looks odd​

• lock → file is used for process locking
• 2023 / 2025 → internal versioning or update cycle
• b45 / b59 → build identifiers from the app
• wl → likely “wallpaper lock” or similar internal tag

It’s just developer naming—nothing standardised.

Are they safe?​

Yes. Completely benign. They:

• are not malware
• are not used by Windows itself
• exist purely for that app’s operation

Can you delete them?​

Yes, but with conditions:

• If Dynamic Theme is running, they may:
  • be locked (can’t delete), or
  • reappear immediately
• If you:
  
  1. Close Dynamic Theme
  2. Delete the files
  3. → they will likely be recreated next time the app updates wallpapers

When to care​

Only if you see:

• thousands of them building up
• unusually large sizes
• activity when the app isn’t installed anymore

In that case, clear the whole cache folder.

Bottom line​

They’re routine housekeeping files from Dynamic Theme’s wallpaper engine.
No action required unless they’re accumulating excessively.