(registered 2026-10-22, last updated 2026-10-22)

Media type name: text

Media subtype name: prs.mtsv

Required parameters: N/A

Optional parameters: charset. If absent, UTF-8 is assumed, as Section 3 of RFC 6657 specifies for text subtypes that define a default.

Encoding considerations: 8bit

Security considerations: MTSV files are text and contain no executable content. No privacy or integrity services are provided or required, and the format contains no references to external resources.

Applications that import MTSV files into spreadsheets can interpret fields beginning with "=", "+", "-", or "@" as formulas and need to treat imported fields as data. Sheet names can contain control characters that could mislead users when displayed. Parsers that do not set limits can exhaust resources on large files. See Section 11 of draft-demosra-mtsv-01.

Interoperability considerations: A text/tab-separated-values file that contains no FF, and no CR other than in CRLF line breaks, is an MTSV file. Applications that support only TSV may present a sheet name line as a field beginning with FF or as a line break. Trimming whitespace or removing control characters can remove sheet boundaries. Sheet names are not required to be unique. See Section 8 of draft-demosra-mtsv-01.

Published specification: draft-demosra-mtsv-01,
https://datatracker.ietf.org/doc/draft-demosra-mtsv/ (source: https://github.com/demos-ra/mtsv-spec)

Applications which use this media: Applications that store or exchange multiple sheets of tabular data as text.

Fragment identifier considerations: N/A

Restrictions on usage: N/A

Additional information:

1. Deprecated alias names for this type: N/A
2. Magic number(s): N/A
3. File extension(s): .mtsv
4. Macintosh file type code: N/A
5. Object Identifiers: N/A

General Comments: The registration template is also in Section 9.1 of draft-demosra-mtsv-01. Files written by a generator begin with FF
(%x0C).

Person to contact for further information:

Name: Demos Ra
Email: demos_ra&hotmail.com

Intended usage: COMMON

Author/Change controller: Demos Ra