1. PDF – Portable Document Format
2. DOC – Microsoft Word Document
3. DOCX – Microsoft Word Open XML Document
4. XLS – Microsoft Excel Spreadsheet
5. XLSX – Microsoft Excel Open XML Spreadsheet
6. PPT – Microsoft PowerPoint Presentation
7. PPTX – Microsoft PowerPoint Open XML Presentation
8. HTML – HyperText Markup Language
9. CSS – Cascading Style Sheets
10. XML – Extensible Markup Language
11. JS – JavaScript
12. PHP – Hypertext Preprocessor
13. SQL – Structured Query Language
14. RTF – Rich Text Format
15. JSON – JavaScript Object Notation
16. SWF – Small Web Format
17. DXF – Drawing Exchange Format
18. BMP – Bitmap Image File
19. SVG – Scalable Vector Graphics
20. DWG – AutoCAD Drawing File
