The PBM_SETRANGE message sets the minimum and maximum values for a progress bar and redraws the bar to reflect the new range.
PBM_SETRANGE
wParam = 0;
lParam = MAKELPARAM(nMinRange, nMaxRange);
Parameters
nMinRange
Minimum range value. By default, the minimum value is zero.
nMaxRange
Maximum range value. By default, the maximum value is 100.
Return Values
Returns the previous range values if successful, or zero otherwise. The low-order word specifies the previous minimum value, and the high-order word specifies the previous maximum value.