If you cannot see Turkish characters in your source code…

RegionalOptions
Advanced
If you cannot see Turkish characters in your source code which you have got from your TFS, that is because your regional settings are incorrect. If you chenge your regional settings as in the screenshots, you will STILL EXPERIENCE the problem, until you reboot your Windows XP Pro (even in SP3). Steps:
1) Change your regional settings as shown in pictures
2) Reboot your system