Sri Lanka GCE O/L IT subject syllabus related slides are here. Most of these are cover in basics of computer science and engineering. You may find File Types related information in here.

1. File Types

2. • What is a file type
• Why there are so many file types

3. Archive and compressed
• 7z
• Bzip
• Gzip
• Rar
• jar

4. Document
• DOC/DOCX
• PDF
• HTML
• XHTML
• PPT/PPTX
• Xls/xlsx

5. Graphics
• GIF (Graphics Interchange Format)
• JPEG (Joint Photographic Experts Group)
• PSD, PDD – Adobe Photoshop Drawing
• PNG – Portable Network Graphic
• RAW – General term for minimally processed image data (acquired by
a digital camera)
• BMP – Microsoft Windows Bitmap formatted image

6. Question
• Select the compressed image format
• RAW
• PSD
• jar
• GIF