alt3

.alt3Allegro Font Format

Allegro CL (Allegiance) · 1997

Developer
Allegro CL (Allegiance)
Category
Fonts
MIME Type
font/opentype
First Released
1997
Open Format
Yes
File Signature
Unknown or proprietary
At a Glance
.alt3
Allegro Font Format

The .alt3 format is a specialized font file used by Allegro CL, mainly for custom fonts in gaming communities.

Reviewed on June 17, 2026
Compression
Varies
Transparency
N/A
Editability
Low
Best for
Custom Game Fonts

Key Features

  • Proprietary font format for Allegro CL.
  • Stores glyph outlines and character metrics.
  • Primarily used for custom game fonts.
  • Niche format within a specific development ecosystem.

Best For

  • Custom fonts specifically for Allegiance mods.
  • Text rendering within the Allegro CL environment.
  • Situations requiring a unique, albeit niche, font format.

Less Ideal For

  • General web use or cross-platform font compatibility.
  • Embedding fonts in standard document formats (PDF, Word).
  • Sharing fonts with users outside the Allegro CL ecosystem.
  • Creating scalable vector graphics (SVG) or vector art.

Common Use Cases

  • Creating custom in-game fonts for Allegiance mods.
  • Defining unique text styles within Allegro CL applications.
  • Sharing font assets within the Allegiance gaming community.
  • Experimenting with custom typography in a Lisp environment.

How to Open It

  1. Open .alt3 files primarily within Allegro CL or related development tools.
  2. Utilize Allegiance game modding tools that support custom font import.
  3. Convert the font data to a more common format like TTF or OTF if a converter tool exists.
  4. Inspect the file structure with a hex editor for signature or basic content clues.

What is a .alt3 file?

The .alt3 file extension is associated with the Allegro Font Format, a proprietary font format developed for use with Allegro CL, a Common Lisp development environment. This format is specifically designed to store font data, including character glyphs, metrics, and potentially embedding information. It was primarily used within the Allegiance gaming community for custom fonts in game modifications and related projects. While not a widely adopted standard, it served its niche purpose within that specific ecosystem.

Programs That Open .alt3 Files

PlatformProgram
WindowsAllegro CLPaidOfficial
macOSAllegro CLPaidOfficial
LinuxAllegro CLPaidOfficial

How to Convert .alt3 Files

FormatMethod
.TTFAllegro CL font tools (if available), Potential third-party converters (rare)
.OTFAllegro CL font tools (if available), Potential third-party converters (rare)

Common Problems with .alt3 Files

⚠️ Lack of universal software support.
Use Allegro CL or specialized modding tools. Conversion to TTF/OTF is ideal if possible.
⚠️ Difficulty finding converters.
Search for specific Allegiance modding community resources or ask in forums related to Allegro CL.

Frequently Asked Questions

What is Allegro CL?

Allegro CL is a commercial integrated development environment (IDE) for the Common Lisp programming language.

Is the .alt3 format widely used?

No, the .alt3 format is quite niche and primarily associated with the Allegiance gaming community and Allegro CL.

Can I open .alt3 files on any computer?

Directly opening and using .alt3 files requires software that specifically supports the Allegro Font Format, such as Allegro CL or specific game modding tools.

Technical Details

Allegro Font Format (.alt3) files contain vector-based font data. The exact internal structure is proprietary to Allegro CL but likely includes definitions for glyph outlines, kerning pairs, and character spacing. As a font format, it's designed for rendering text and is not intended for general data storage or complex multimedia.

Did You Know?

The .alt3 format's association with Allegiance means it's often found in files related to custom game modifications.
Its development was tied to a specific version or configuration of Allegro CL, making its ecosystem quite limited.

Security Information

As a font format, .alt3 files are generally considered low-risk. However, always download files from trusted sources, especially within gaming communities, to avoid potentially malicious modifications or unrelated malware.