Now its possible to convert....
sis to sisx ( s60 3rd edition phones apps )
sis to jar ( Java , Midp , v1.0 , Midp 2.0 apps)
sis to jad
sisx to sis
sisx to jar
jar to sis ( s60 first and second edition phones apps )
DOWNLOAD LINK
http://uploading.com/files/8a2mfc1a/sis-To-sisx-And-Jar-converter.zip/
