I have a few files that them format are .com and .exe . they don't open with Command prompt.
help me please
thanksWhat version OS are you running? what are these programs you are trying to run?

I believe you are running into an incompatability between the OS and the programs that are .com and .exe . You may need to run them in dosbox or on an OLDER computer with earlier OS installed to support them. I have some old games written in the 1980s that only work on Windows 98 SE and older OS.

http://www.dosbox.com/Hi hoseink08,

Win 7

Click start type in cmd in the search it should POP up the command prompt window then type in cd filepath.exe or .extention it should load up if there is any ERROR it will not load but you may be able to see the error msg.

Win XP

Click start click cmd then us same step as above.

For general reference.
Most new PCs are coming with N64 bit OS, either Winnows 7 or 8 versions. These 64 bit versions do not allow the 16 bit programs to run in native mode. For good reasons. It is by design. To do a 16 bit program in the 64 bit environment, there has to be some kind of shell or wrapper around the program. This is called a Virtual Machine.
Here is a video.
http://www.youtube.com/watch?v=IwxoSnWsMdk
Also, look at virtual box.
https://forums.virtualbox.org/
What's the name of these files...and where are they from ? ?