I have found problem with finding file offset which actually is program entry point.
In case I experience problem, value of AddressOfEntryPoint is 0x1018. Here is a section which maps this address.
I assume entry point should be
0x28 = 0x10 + 0x1018 - 0x1000 (PointerToRawData + AddressOfEntryPoint - VirtualAddress)
However tools says it is 0x18 instead. I'm not sure why, made some experiments and came up with another formula.
0x18 = (0x10 / 0x200) * 0x200 + 0x1018 - 0x1000 ((PointerToRawData / FileAlignment) * FileAlignment + AddressOfEntryPoint - VirtualAddress)
I use FileAlignment from OptionalHeader and it works great, however I don't know if it is a coincidence or somewhere documented, so asking here for confirmation.
Also, probably not important, but file is packed with UPack(0.399), packer signature BE****AD50FF7634EB7C4801.