>I want to save in a resource file the value of grid row height, if user changes it, so that next time the grid is instantiated the height will be preserved. To determine that user did change the grid height I will compare the current height with the default value. In my VFP the default value of any grid RowHeight value is 18. I want to be sure that this value is not a function of some fonts on the end user PC. Therefore, can I safely assume that no matter where my app is running the default value of the RowHeight property will be 18?

No you can't rely on it being 18 all the time (what I remember is 19). Instead set to -1 to get the default.
Cetin