You SHOULD be able to just rename the Oper Mini executable to: OperaL.exe and then copy this over the existing file in the \windows directory
Except that Opera Mini is a Java Midlet
The correct answer is to use SSMaPa, and use it to point to a .lnk file you create to open Opera Mini by referencing JBed ("28#"\windows\jbed.exe" - run s0_")