If the attached file begins with a '^', ignore/skip that character in the file
path. This should resolve the error reported by Ken  of Section One BBS:
ERROR line 850, attachment file not found: ^C:/SBBS/XTRN/BRE777/...

SBBSecho v2.x included this work-around and it was not included in the v3
re-factoring/re-write. Of course, BRE is doing something wrong and is totally
at fault here, but no one expects BRE to be fixed... ever. :-)