It is not a secret that I'm learning assembly. That's why FASMW is great to learn by example. I made some changes to it:

- Added XP controls (InitCommonControls)
- Added XP ABOUT dialog (ShellAboutA from shell32.dll)
Both changes run fine on Win98 too.

Although it's a learning experience (long and hard), there are more interesting changes in perspective:

a) Add a Toolbar, with the most used commands
|Open|Save|SaveAs| |compile|Run| |Find|Replace|

b) Compile ProgressBar in statusbar It may look as nice as in Firefox :)

c) BrowseForFolder in the Config dialog to Select the "Include" path (Options/Compiler Setup)

d) Find/replace all in one single form like VB6 replace dialog
-> Form call is l.1335
-> Form buttons are l.2017

e) Custom About Dialog with the look of windows with white header and icon

Can someone please help by throwing a sample of a toolbar or progressbar,
or saying what's wrong with this About dialog? (Transparent background on EDIT control works fine on XP but not Win98)

Somehow you displayed your text relative to SCREEN not your CHILD (the about window). Fascinating
I can't help you now because I'm not tuned in for FASM right now, but what I CAN say is that it is possibly a very simple constant to change. Try to find something that draws text and accepts flags to write to window NOT to desktop.
Good luck!