# Please decipher this string
**URL:** https://community.mp3tag.de/t/please-decipher-this-string/65715
**Category:** Support
**Created:** [August 24, 2024, 4:09pm UTC](https://community.mp3tag.de/t/please-decipher-this-string/65715 "2024-08-24T16:09:58Z")
**Posts on this page:** 3
**Page:** 1
### Author:  [@walb77](https://community.mp3tag.de/u/walb77)
#### Post date: [August 24, 2024, 4:09pm UTC](https://community.mp3tag.de/t/please-decipher-this-string/65715/1 "2024-08-24T16:09:58Z")
I’m new to Mp3Tag. Could someone please explain each “section” of this string? (E.g. what does the “64” do? This is converting Filename to Filename. Adding a letter to the beginning of the filename. Thanks for your help.
Old Filename pattern
%1 - %2 - %3
New filename pattern
$char($add($num(%1,1),64)) - %2 - %3
---
### Author:  [@ohrenkino](https://community.mp3tag.de/u/ohrenkino)
#### Post date: [August 24, 2024, 4:52pm UTC](https://community.mp3tag.de/t/please-decipher-this-string/65715/2 "2024-08-24T16:52:26Z")
Here is the documentation about scripting functions:
> **[Scripting Functions – Mp3tag Documentation](https://docs.mp3tag.de/scripting/)**
>
> Documentation on Mp3tag's scripting functions. Mp3tag is the universal Tag Editor.
See this external page which shows the ASCII codes:
> **[ASCII table - Table of ASCII codes, characters and symbols](https://www.ascii-code.com/)**
>
> A complete list of all ASCII codes, characters, symbols and signs included in the 7-bit ASCII table and the extended ASCII table according to the Windows-1252 character set, which is a superset of ISO 8859-1 in terms of printable characters.
64+1 = 65 -\> code for character A.
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### Author:  [@system](https://community.mp3tag.de/u/system)
#### Post date: [September 23, 2024, 4:52pm UTC](https://community.mp3tag.de/t/please-decipher-this-string/65715/3 "2024-09-23T16:52:31Z")
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