This specific update was a "bug-fix" release that improved the program's reliability for power users:
Picasa saves a hidden copy of your original photo, allowing you to experiment with filters, cropping, and color correction without ever losing the original file. Picasa 3.9.138.150 for Windows
Automatically scans your computer for images and organizes them into folders and albums based on date and metadata. This specific update was a "bug-fix" release that
Corrected issues where file extensions were not properly preserved during "Save As" operations. allowing you to experiment with filters
Despite its age, this version of Picasa offers a robust set of features that many modern cloud-based apps lack: