Why are .exe extensions changed to .dat when we share a s...

For security.

Tuhund is one of the most secure ERP. It is more secure than your bank portal. It can neither be hacked nor can it be used to attack other servers. Tuhund is continuously and vigorously tested for any security vulnerabilities by our partner firm specializing in IT security and at this moment we are absolutely secure. To achieve this we have taken a number of measures, most of which are invisible to the end users. However, there are a few that are noticeable. 

Tuhund does not allow upload of any executable files including java class files, jar, war, php, jsp, jspf and so on. These files can be used by hackers to deploy backdoor entry scripts on the server. Similarly Tuhund also does not allow upload of any files that can be used to propagate virus and Trojans. In most places we have blocked the upload of such files but in chat and few other places we permit upload but auto change extension. If you are sharing an exe file with another user in chat, all the recipient needs to do is to right click on the line and click on save as and save with exe extension again. 

For any detected security threat, system admin will immediately be sent an email message by the server.