I want to make new Crater model

[+wingwiner 13]

Where should I place a new crater .lod and .tga files to work with Strike Fighters ? What .ini file determine craters effects or properties ?

[Fubar512 1,350]

Any 3rd party Crater.lod and Crater.tga files should reside in the Flight folder. The crater type association is called out in the Missileobject.ini. As to what file specifically determines the crater's .ini parameters, I suggest that you start perusing the various cat files, though I suspect that it may be hard coded.