If the font used in the drawing is not present on your PC, install it to see your drawing properly. 
If you cannot do that, opening the drawing with SilicaCAD a dialog box for fonts substitution shows up. 
Choose the font compatible with the one to replace. 
NOTE 
To ensure the correct management of installed Bigfonts you must change the file Bigfont.ini 
Start -> All Programs -> SilicaCAD 2XXX pro ENG -> Utility ->User Support Folder 
this file specifies the language to which the installed font belongs. 
SYNOPSIS: 
“Name of the font with”; ” language reference number” 
CODES OF REFERENCE LANGUAGES: 
JAPANESE_CODEPAGE_INDEX = 1, 
TRADITIONAL_CHINESE_CODEPAGE_INDEX = 2, 
KOREAN_CODEPAGE_INDEX = 3, 
SIMPLIFIED_CHINESE_CODEPAGE_INDEX = 5 
Example 
for a font that is called chinas_fzhjt.shx in simplified Chinese, you will add a row 
chinas_fzhjt.shx; 5