Avoid write mode when opening save files #7694
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It seems that MinGW doesn't support opening files in exclusive mode. I'm hoping it supports append mode, at least.
https://sourceforge.net/p/mingw-w64/bugs/493/
The main difference here is that the game client will have to run
GetFileSize()on newly created files and also open the file twice. The difference should be negligible, especially considering that the vast majority ofMpqWriterinstances will be opening existing files.This resolves #7693