Ensure cross-platform compatibility by using UTF-8 encoding

[ReubenUKGB]

Overview:
This pull request addresses the UnicodeEncodeError encountered on platforms such as Windows due to encoding issues when writing certain files with unsupported characters.

Changes Made:

• Explicity use UTF-8 encoding when writing to files, preventing UnicodeEncodeError.

Why:

• On Windows, the default encoding 'cp1252' is used and causes issues when writing to files with certain characters.
• Using UTF-8 encoding ensures broader compatibility and resolves the encoding error.

Testing:

• Tested on Windows to confirm the resolution of the UnicodeEncodeError.

Dependencies:
None.

Additional Notes:

• This change improves cross-platform compatibility by resolving the specific encoding issue reported in: add encoding for create m3u file. #235.

[ReubenUKGB]

Closed due to duplicate.