It's probably something on my windows then, but i did some messing around and happens that i figured out how to open files again. Here's what i did if someone run into this too.
1 - Go to program folder (C:\Program Files (x86)\Steam\steamapps\common\CameraBag 2);
2 - Right click on "CameraBag2.exe" and then choose "Troubleshooting Compatibility";
3 - On the next window, choose "Troubleshoot Program" option.
4 - Check "The program worked in earlier versions of Windows..." and "The Program works but doesn't display correctly", and then Next;
5 - Choose "Windows 8" and then Next.
6 - Choose "Error message saying the program needs to run in 256 colors or 8-bit color mode", then next;
7 - Click on "Test Settings" and see if the program works... Worked for me!
8 - If it worked (i hope), go back to the troubleshoot windows and click Next, then choose "Yes, save these setting for this program".
The window to open files change then, but it finally works!