lParam2 (LONG)

Specifies how the lParam1 parameter is interpreted:

SEEK_SET

Seek to an absolute (time units from the beginning of the file) seek position specified in lParam1. This is the default.
SEEK_CUR
Seek to a relative (time units from the current file position) seek position specified in lParam1. (The value of lParam1 can be positive or negative.)
SEEK_END
Seek to lParam1 time units from the end of the file. (The value of lParam1 can be positive or negative.)

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