From Just Solve the File Format Problem
.HTA is a file format associated with products from Hemera Technologies. An HTA file contains a collection of thumbnail images, and is usually named "thumbs.hta".
An HTA file starts with bytes
89 'H' 'T' 'A' 0d 0a 1a 0a.
- Photo Clip Art 10,000 → Data/Photo Clip Art 10,000/thumbs.hta (GIF)
- PC Answers #87 → graphics/HEMERA/INSTALL/THUMBS.HTA (PNG)
- PC Format issue 112 → 101/Creative/PoGd63/INSTALL/THUMBS.HTA (PNG)