Here is instructions on adding common WAP MIME types:

1) Go to Start, Programs, Administrative Tools, Internet Services Manager.
2) Right-click the machine name, and select Properties.
3) Click Computer MIME Map, then click Edit to list the existing MIME types. Add the following MIME types by clicking New Type and typing the following information:

-For file extension .wml, type "text/vnd.wap.wml" (without the quotes).
-For file extension .wmlc, type "application/vnd.wap.wmlc" (without the quotes).
-For file extension .wmls, type "text/vnd.wap.wmlscript" (without the quotes).
-For file extension .wmlsc, type "application/vnd.wap.wmlscriptc" (without the quotes).
-For file extension .wbmp, type "image/vnd.wap.wbmp" (without the quotes).

Regards

Rubal Jain