I'm going entirely from memory here, so expect things to be incorrect.
1) Open two windows of XVI32, one with the original map, one with your MPQ rebuilt map.
2) In the first window (original) click on the very first byte (should say "HM3W" on the right side), then go to Edit->Block n chars, and do 512. After that, go to Edit->Copy->Copy as hex string
3) In the second window (MPQ rebuilt) click on the first byte (should say "MPQ" on the right), then go to Edit->Paste, or something. This should insert what was copied from the first map, bumping everything else 512 bytes forward.
Spoiler:
xkiska wrote:BARTIMEAUS is more understandable then u
Senethior459 wrote:Wow, Dream Theatre reminds me of Dragonforce, but with real skill.
Ozzapoo wrote:We laughed, we cried. Trashed.
FatherSpace: You don't find smart chicks hawt?
GeorgeMots: not anymore, im fed up with that kind of girls
FatherSpace: lol
FatherSpace: What happened?
GeorgeMots: most smart girls find out that i date/do/see other girls....
FatherSpace: ...
FatherSpace: So monogamy is your enemy?
Bartimaeus: Hmm, well, I hope my sister hasn't been kidnapped.
FatherSpace: What happened, Bart?
Bartimaeus: She walked out of the house saying that she was going over to some friends, and it's been like two hours, and my mom is trying to get a hold of her, which she's been unable to.
Bartimaeus: I can also hear three car alarms going off.
GeorgeMots: how old is she?
Bartimaeus: I haven't a clue. Probably 17.
UndeadxAssassin: wut
AbusivePie: You don't know how old your sister is?
Bartimaeus: Nope.
UndeadxAssassin: Epic fail
GeorgeMots: is she cute??
Bartimaeus: So, uh, how about you get into the Christmas spirit and put that avatar on before I do it myself and take away your bloody avatar-changin' rights?
UndeadxAssassin: If I thought of a random one...
UndeadxAssassin: Like....
UndeadxAssassin: I'll get back to you on that