Default Programs - Associate a File Type or Protocol

Thanks, but that's the version I'm using. It allows for a portable install. I guess I'll fix it by reinstalling windows.

The file extension I want to set default association for isn't listed, and checking the registry I see it is not there either. How can I add a new entry for the extension to the registry? The program in question is MetaTrader4, the extensions are .mq4 and .mqh among others.

(Have tried reinstalling with UAC turned off and with Admin privileges but it hasn't helped, also tried using compatibility wizard on the installer but again didn't help)

Well the FAQ is mistaken in the case, have been using MetaTrader for a long time and the .mqh (header files for adding library code) have always been associated before under different operating systems, even under the same operating system when different brokers are used. (Each broker distributes their own copy of MT4, for some reason some broker's distributions associate correctly). Using 'open with' doesn't seem to do anything in regards to the association.

Brink,

There are a number of file extensions listed in the default program setting that show as "unknown." Some of these seem like they ought to have a program, like an excel library ought to be associated with excel.

Is unknown a legitimate association?
And is there is quick way to correct or reset to default all such ones?

Thanks.

Dear Brink,
I accidentally changed the default program for opening a .py file (python code) to the command prompt . It will not let me change it back to python.exe! Do you have a .reg file for this? If not, what can I do?!
Thanks,
vincemoe

Thanks for the speedy reply,
unfortunately when I go to select "Always use this program to open the selected type of file" the check box and words are grey and wont let me check it, it seems as if me selecting the command prompt to open it locked it up.