What is the HOT file format?
A .hot file is a proprietary binary game data file used by The Sims (2000, Maxis / Electronic Arts). Within The Sims 1 engine, .hot files store object clone data - 3D object definitions paired with associated texture and audio data - which the game loads at runtime to populate its world with interactive items. The format belongs to the same binary family as The Sims' .IFF and .far archive formats and follows the little-endian byte-order conventions standard for Windows-era EA titles.
The internal structure is not publicly documented, and no magic byte signature has been established for the format. Community tools such as SimPE (Sims Package Editor, open-source) can inspect and in some cases edit .hot files.
The .hot extension also appeared historically in NCSA Mosaic (1993) as a hotlist bookmark file, but that use is entirely obsolete; virtually all .hot files encountered today are Sims game data.
With The Sims 2 (2004), Electronic Arts replaced this format with the DBPF .package container, which became the standard across all subsequent Sims titles. The Sims 1 is effectively abandonware; original .hot files are relevant only for preserving or modding the original game.
Security & safety
RISK: LOWHOT files are internal The Sims game data with no executable code or macro capability. Safe to have on your system as part of a legitimate Sims 1 installation. The only risk is accidental deletion (can break the game); keep a backup of original game files if modding.
Format details
in a nutshell- NCSA Mosaic Internet Address File (Hotlist) - The original use of .hot - NCSA Mosaic (first graphical browser, 1993) used .hot files as URL bookmark lists (hotlists). Format obsolete since mid-1990s.
Programs that open HOT files
Windows2 apps
The Sims (EA/Maxis)
Paid HOT files are loaded automatically by The Sims 1 game engine from the game directory - they are not opened manually by the user.
SimPE (Sims Package Editor)
Open-source Community modding tool for The Sims 1/2 package formats. Can inspect and edit HOT/IFF files. Last stable release circa 2010s; still functional on older Windows. 
macOS1 app
The Sims (EA/Maxis - Mac version)
Paid The Sims 1 had a macOS release; HOT files are used internally by the game. Technical details
deep spec| File type | Proprietary binary game data - object clone data with associated textures and audio |
| Byte order | Little-endian (standard for Windows-era EA/Maxis games) |
| Game | The Sims (Maxis / Electronic Arts, released February 4, 2000) |
| Contents | 3D object clone data with associated texture and audio data used by The Sims 1 engine at runtime |
| Format family | Related to The Sims 1 .iff and .far binary archive family (Maxis proprietary formats) |
| Magic bytes | None publicly documented; binary format, internal structure not officially released |
| Typical file size | Small - typically in the kilobyte range (a game asset chunk, not a bulk archive) |
| Platform | Windows; macOS (The Sims had a Mac port) |
| Modding tools | SimPE (Sims Package Editor) - open-source community tool, last actively maintained circa 2010s |
| Successor format | DBPF .package container (The Sims 2, 2004, and all subsequent Sims titles) |
| Historical naming conflict | .hot also used by NCSA Mosaic (1993) for hotlist bookmarks - that use is fully obsolete |
| Abandonware status | The Sims 1 is no longer commercially sold; .hot files exist only in preservation and modding contexts |
| Released | 2000 (The Sims, released February 4, 2000) |
| Latest version | N/A (associated with The Sims 1 era) |
HOT conversions
Community Q&A
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