lParam2 (LONG)

Contains one of the following values:

SEEK_SET

Moves the file pointer to be lParam1 bytes from the beginning of the file.
MMIO_SEEK_IFRAME
This results in a seek to the nearest I-frame preceding the position determined by lParam1 and the other lParam2 flags.
SEEK_CUR
Moves the file position to be lParam1 bytes from the current position. lParam1 can be positive or negative.
SEEK_END
Moves the file position to be lParam1 bytes from the end of the file. lParam1 can be positive or negative.

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