I use KeePassDroi d (annoying text break) on Android, KeePassX on Mac and Linux but the Windows KeePass doesn't read the same file type as the others, unless I'm missing something? I want to use the same database file for all three OSesess.
KeePass 1.x does not support the new database format and saves its databases as KDB files. KeePass 2.x uses the new database format (KDBX) and it can also import KDB databases created with KeePass 1.x.
See the differences here:
http://keepass.info/compare.html
http://keepass.info/help/v2/version.html
I use the same combination myself (KeePassDroid on Android, KeePassX 2 alpha on Linux, KeePass 2 on Windows) with a single KDBX database and I can read the database fine on all OSes. However, I avoid editing the database on Android and on Linux, since KeePassX 2 is still alpha, while KDBX support in KeePassDroid is still experimental.