For maximum compatibility and to avoid the problem. All files sending via internet, including e-mail and other websites, should be named with the following requirements.

- use only lowercase English letters, numbers, and the "underscore (_)"
- always start with a lowercase English letter
- no space
- no Thai or any other language or symbol

Example

Good:
homework.doc
file_52102550004.pdf
image_jamjun.jpg
reportsummary.docx

Bad:
สรุปผลการดำเนินการโครงการ 15 มีนาคม 2555.docx
001.jpg
photo of me.jpg
file-upload-today.doc