Perl write to file returns huge weird stacktrace - perl

Question

I have the following problem: when I try to save the file that contains a semicolon in the name it returns a huge and weird stacktrace of the characters on the page. I've tried to escape, to trim and to replace those semicolons, but the result is still the same. I use the following regex:
$value =~ s/([^a-zA-Z0-9_\-.]|;)/uc sprintf("%%%02x",ord($1))/eg;
(I've even added the |; part separately..)
So, when I open the file to write and call the print function it returns lots of weird stuff, like that:
PK!}�3y�[Content_Types].xml ���/�h9\�?�0���cz��:� �s_����o���>�T�� (it is a huge one, this is just a part of it).
Is there any way I could avoid this?
Thank you in advance!
EDIT:
Just interested - what is the PK responsible of in this string? I mean I can understand that those chars are just contents of the file, but what is PK ? And why does it show the content type?
EDIT 2.0:
I'm uploading the .docx file - when the name doesn't contain the semicolon it works all fine. This is the code for the file saving:
open (QSTR,">", "$dest_file") or die "can't open output file: $qstring_file";
print QSTR $value;
close (QSTR);
EDIT 3.0
This is a .cgi script, that is called after posting some data to the server. It has to save some info about the uploading file to a temp file (name, contents, size) in the manner of key-value pairs. So any file that contains the semicolon causes this error.
EDIT 4.0
Found the cause:
The CGI param function while uploading the params counts semicolon as the delimiter! Is there any way to escape it in the file header?

Answer 1

The PK in file header it means it is compressed ZIP like file, like docx.
One guess: The ; is not valid character in filename at the destination?
Your regexp is not good: (the dot alone is applicable to any character...)
$value =~ s/([^a-zA-Z0-9_\-.]|;)/uc sprintf("%%%02x",ord($1))/eg;
Try this:
#replace evey non valid char to underscore
$value =~ s/([^a-zA-Z0-9_\-\.\;])/_/g;