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    public const int GM_COMPATIBLE = 0x1;

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    public const int GM_ADVANCED = 0x2;

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      GM_COMPATIBLE = 1,

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      GM_ADVANCED = 2,

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Documentation

[GM_] on MSDN

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    /// Value    Meaning GM_COMPATIBLE Sets the graphics mode that is compatible with 16-bit Windows.

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    /// GM_ADVANCED Sets the advanced graphics mode that allows world transformations.

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GM_

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    ///    Indicates that the compound file already exists and the grfMode parameter is set to STGM_FAILIFTHERE.

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    ///    Indicates that the compound file already exists and the grfMode parameter is set to STGM_FAILIFTHERE.

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        /// The compound file was not created with the STGM_SIMPLE flag

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    ///The compound file was not created with the STGM_SIMPLE flag

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    [Description("The compound file was not created with the STGM_SIMPLE flag")]

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    '''The compound file was not created with the STGM_SIMPLE flag

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    <Description("The compound file was not created with the STGM_SIMPLE flag")> _

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    STGM_READ = 0x0,

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    STGM_WRITE = 0x1,

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    STGM_READWRITE = 0x2,

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    STGM_SHARE_DENY_NONE = 0x40,

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    STGM_SHARE_DENY_READ = 0x30,

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    STGM_SHARE_DENY_WRITE = 0x20,

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    STGM_SHARE_EXCLUSIVE = 0x10,

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    STGM_PRIORITY = 0x40000,

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    STGM_CREATE = 0x1000,

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    STGM_CONVERT = 0x20000,

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    STGM_FAILIFTHERE = 0x0,

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    STGM_DIRECT = 0x0,

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    STGM_TRANSACTED = 0x10000,

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    STGM_NOSCRATCH = 0x100000,

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    STGM_NOSNAPSHOT = 0x200000,

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    STGM_SIMPLE = 0x8000000,

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    STGM_DIRECT_SWMR = 0x400000,

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    STGM_DELETEONRELEASE = 0x4000000