I get crazy with this stuff and need help.
I want to add custom chars or change chars in a TTF file.
I experimented with FASMW but found out that it can not handle proportional fonts like arial.

Okay - this wouldn't be the big problem I could use a customized "Courier New" font with some special graphic characters which do not exist in standard charsets.

But when I change the font with FontForge my changes are made in all windows applications - except FASMW (IDE/editor).

I changed the character exclamation mark to a simple point.
If I double click the TTF file, this change is seen on screen.
If I use Courier New in Open Office, this change is seen on screen.

If I use FAMSW.EXE with Courier New it shows the old exclamation mark.

Hmm - what is going on there ?

Help appreciated from experienced users with fonts.

If I copy the font file to C:\Windows\Fonts the font seems to be restored. If I double click on the font file, the exclamation mark seems to be restored. But how can OpenOffice display my changes for this character while FASMW cannot ???

I think I finally found the solution.
The font name (lpszFace) may not be mixed up with the pitch (fdwPitchAndFamily) like FIXED_PITCH or VARIABLE_PITCH.

The following example worked in FASMs example minipad:

There is some more issue why I couldn't modify the desired font "Courier New" and update this font. Some fonts (like this) are digitally signed (which is stated when double click for the view of font).

So I used another unsigned (monospaced) font to modify.

I am surprised, that OpenOffice can use the unsigned font.