The WinForms application that I support is broken down into a very small portion of user machines (perhaps around 4 today). The application crashes each time for these users, and it crashes until the very first dialog box is displayed.
Exception
Source:
System.Drawing
Message:
Font 'Arial Black' does not support style 'Bold'.
Stack Trace:
at System.Drawing.Font.CreateNativeFont()
at System.Drawing.Font.Initialize(FontFamily family, Single emSize, FontStyle style, GraphicsUnit unit, Byte gdiCharSet, Boolean gdiVerticalFont)
at System.Drawing.Font.Initialize(String familyName, Single emSize, FontStyle style, GraphicsUnit unit, Byte gdiCharSet, Boolean gdiVerticalFont)
at System.Drawing.Font..ctor(String familyName, Single emSize, FontStyle style, GraphicsUnit unit, Byte gdiCharSet)
One of the fonts that the application uses is Arial Black:
this.label3.Font = new System.Drawing.Font("Arial Black", 8.25F, System.Drawing.FontStyle.Bold, System.Drawing.GraphicsUnit.Point, ((byte)(0)));
The first time it crashed, I noticed a font that was on the user's computer, but not mine. It was called "Arial Black Italic" and it was dated 1997. This was the file name:
ARBLI ___. TTF

The user had Windows XP.
, . , 22 . , "Arial Black Italic" , .
Windows 7, , .
.