Telegram is one of the most popular messaging platforms in Cambodia. But the Khmer font on Telegram Desktop is so small that we cannot read them properly (as shown in above image). You can, of course, customize/change the font on your Telegram Desktop with these simple steps:
Run the Command Prompt (Windows Key + R) and type "regedit". (You may be asked to grant permission to run, so please click Yes).
Navigate to: Computer/HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows NT\CurrentVersion\FontSubstitutes
Go to MS Shell Dlg2
Right click on MS Shell Dlg 2 and choose Modify...
Type in a font name you want to change to and then click OK
Restart or Logout your computer and it's done.
After you have done the above steps successfully, the result would be like this: