Windows 7 programs dll files messed up

[mrvinc911]

Hello I'm a coder and I'm codding with dev c++ and I tried to open a dll file with dev c++ and all dll files opened up with dev c++ can any one tell me how to fix this please and I already tried a system restart.

 

[zvit]

Welcome to the forums!

1. Open the "Start" button and click the "Default Programs" shortcut. Click the "Set Associations" option.
2. Scroll down the list to find the file extension you want to change. Click it to select it.
3. Click the "Change program" button. Click the program you want to use to open the file. If the program doesn't appear, click the "Browse" button to find it. Click "OK" to set the file association.