[Bug 2337] New: Strange IO behaviour, broken seek/rewind?

[Wine Bugs]

http://bugs.winehq.org/show_bug.cgi?id=2337

Summary: Strange IO behaviour, broken seek/rewind?
           Product: Wine
           Version: 20040615
          Platform: PC
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: major
          Priority: P2
         Component: wine-kernel
        AssignedTo: [e-mail]
        ReportedBy: [e-mail]

After upgrading wine to 20040615 from 20031212-1fc1winehq a program that used to
work now produced messages saying that its temporary files are corrupted. These
files are rather frequently read and written by the software.

With the old software the file was like
0000000: 4652 3542 0a05 0000 0026 7b00 3200 4300  FR5B.....&{.2.C.
....   
00000c0: 0100 0100 4652 3542                      ....FR5B

with the new version
0000000: 0000 0000 0000 0000 0000 0000 0000 0000  ................
all bytes zero to
00000a0: 0000 0000 0000 0046 5235 420a 0200 0000  .......FR5B.....
....
0000140: 0000 0100 0000 0000 0100 4652 3542       ..........FR5B

All files written by this program have some heading of only zero bytes and then
start normally so it seems that wine failed to truncate the file correctly or
the seek didn't work.

The problem happens with Finereader (seems to be C++ compiled to ix86), multiple
saves with notepad to the same file work. So perhaps the api changed slightly
and finereader uses the file io calls with uncommon combination of
arguments/parameters.