: A feature-rich alternative that remains faster than Adobe. It includes tools for collaboration, digital signatures, and handwriting recognition.

If you need to do more than just read, certain tools provide editing capabilities specifically for older Windows versions.

For features not supported by legacy desktop apps, you can use through an updated browser (if available on your XP setup): PDF Expert

: Known for its robust annotation and markup tools. The version compatible with Windows XP allows for basic editing and managing of files.