Windows 7: Display properties in custom column

I have created my own extension for a file, which when opened with a notepad, stores its content (properties) in xml format. I wanted to display these file properties in custom columns named like disk size, ram etc
eg. like in windows virtual pc, the .vmcx machine has its properties in xml format, and in its folder, custom columns display its memory, status etc.

Please reply asap
thnx in advance

Those columns are not custom. They are predefined.

Click on the column name, then select MORE menu and check out the list of all possible column names.
Many of those entries are activated only for specific file names.

Anything other than those options is not possible, at least in standard shell - explorer.exe