Text editing related question in C++ Builder, please help.

My text editor is pretty much completed, just that whenever I associate (.txt) file to it, double clicks on a text file, the program started, but just won't open the text file instead it start a new untitled file. is there something I can put in the formcreate to fix this?

Yes, the command line argument contains the file name of the file that you opened. Just parse it out and you should be good to go.

Use the ParamStr call in C++ Builder to get the runtime arguments, i.e. the filename to autoload will be at index zero:

extern PACKAGE AnsiString __fastcall ParamStr(int Index)

When setting up the registry, take care to do this correctly, otherwise spaces in the file path will be treated as argument seperators and your filename will be broken across several indicies.

When setting the 'HCLASSES_ROOT/Product_Name/shell/open/command' key, use the following format:

"full app path" "%1"

make sure you include the quote marks as above.