Outlook MSGs and PW

When a user drags an email from Outlook to PW, PW is replacing all periods (.) in the subject line with underscores.

Is there a way to preserve the original subject line.

Example subject line: FW: 14.4120 190205 192135 190205_28.3000

Once placed in PW the file name becomes: FW_ 14_4120 190205 190205_28_3000

Is there a setting that controls this?