Quartus8.1 Memory Initialization File Warning

Thanks for you help, but I still have not solve my problems.

When I found the Critical Warning: Can't read Memory Initialization File or Hexadecimal (Intel-Format) File ROM1.hex -- setting all initial values to 0.

I try to open the *.hex file,but I can not open it again.As you can see the messages from the following picture. I uploaded it from my computer.

I have meet the same situation many times, and I don not know why.

I am sure that I have add the *.hex file to my project, and the *.hex file is directly in the directory where I found my project,as you can see from the attached pictures.

Thank you again.