[How to!] Use old GFWL savegame in Steamwork version
Backup C:\Program Files (x86)\Steam\userdata\<userid>\200260\remote
Your GFWL savegame have your GFWL username as prefix.
<GFWLusername>-save#.sgd
Delete all files EXCLUDING these files: (remember the folder backup)
profile.bin and <GFWLusername>-save#.sgd
Open with a HEX editor the savefile you want <GFWLusername>-save#.sgd
Lets say Sharkiller-save0.sgd
Image Search Type HEX: 00 00 00 03 00
Image Select all the text BEFORE the searched text
Image And delete.
Save and remove your gfwl usename from the file. "save0.sgd"
Open the game and you have your working savegame there.
Tips
Don't mix patched with unpatched savefiles or the game could crash.
I'm using Hex Workshop but here's a free one:
http://www.softpedia.com/progDownload/tiny-hexer-Download-35737.html
Another posible locations for the savegames
Arkham City
C:\Program Files (x86)\Steam\userdata\<userid>\57400\remote
C:\Program Files (x86)\Steam\userdata\<userid>\200260\remote
%USERPROFILE%\Documents\WB Games\Batman Arkham City\SaveData
%USERPROFILE%\Documents\WB Games\Batman Arkham City GOTY\SaveData
Arkham Asylum
C:\Program Files (x86)\Steam\userdata\<userid>\35010\remote
C:\Program Files (x86)\Steam\userdata\<userid>\35140\remote
%USERPROFILE%\Documents\Square Enix\Batman Arkham Asylum\SaveData
%USERPROFILE%\Documents\Square Enix\Batman Arkham Asylum GOTY\SaveData
Final location of patched savegames
Arkham City
C:\Program Files (x86)\Steam\userdata\<userid>\200260\remote
Arkham Asylum
C:\Program Files (x86)\Steam\userdata\<userid>\35140\remote