为啥需要这个？

直接steam检验文件完整性

虽然是挖坟，但考虑到可能后面有人有需要。
没acf文件，steam根本就认不出来你安装好了游戏，何谈验证游戏完整性？
新建记事本，复制进去，保存并退出，然后把txt重命名为appmanifest_578080.acf
"AppState"
{
"appid" "582010"
"Universe" "1"
"name" "MONSTER HUNTER: WORLD"
"StateFlags" "4"
"installdir" "Monster Hunter World"
"LastUpdated" "1533831816"
"UpdateResult" "0"
"SizeOnDisk" "18123074173"
"buildid" "3016472"
"LastOwner" "76561198082466192"
"BytesToDownload" "0"
"BytesDownloaded" "0"
"AutoUpdateBehavior" "0"
"AllowOtherDownloadsWhileRunning" "0"
"ScheduledAutoUpdate" "0"
"UserConfig"
{
"language" "english"
}
"InstalledDepots"
{
"582011"
{
"manifest" "3709864839019665269"
}
}
"MountedDepots"
{
"582011" "3709864839019665269"
}
}