Problem in opening .asm files in a 64bit Windows 7

Hi, I’m trying to run assembly language codes .asm files in my 64bit Windows 7 Pc, but in vain.
I got a solution that I need to install another software for that. But I’m not sure whether it will work or not.
In addition, I’m getting this error.

Error:
The version of this file is not compatible with the version of windows you're running.Check your computer's system information to see whether you need an x86(32-bit) or x64 (64-bit) version of the program,and then contact the software publisher.
Any tips?
Thanks.
