Image
What is a .cal file?
A .cal file is a CALS Compressed Bitmap. This is an image format — a picture, drawing or graphic. Confusingly, this extension has been used by 6 different formats over the years — they're all listed below.
This extension has been used by more than one format
6 different formats have claimed .cal over the years, so two files with the same extension aren't necessarily the same kind of thing.
- CALS Compressed BitmapNo version recorded · x-fmt/28
- SuperCalc SpreadsheetVersion 4 · x-fmt/363
- SuperCalc SpreadsheetVersion 5 · x-fmt/364
- SuperCalc SpreadsheetVersion 1 · fmt/403
- Broderbund The Print Shop/PrintMaster/American Greetings ProjectVersion 10-23 · fmt/1300
- PrintMaster Gold ProjectVersion 1 · fmt/1302
How to open a .cal file
- GIMP (free) and IrfanView open a very wide range of image formats, including obsolete ones.
- XnView MP is the best bet for unusual or legacy image types.
- Your operating system's built-in viewer may work for mainstream formats.
The registry records this extension against CALS Compressed Bitmap, SuperCalc Spreadsheet, SuperCalc Spreadsheet and others, so software from that family is the most likely match.
How to convert a .cal file
- Open it in GIMP or XnView and export as .png (lossless) or .jpg (smaller).
The technical record
For archivists, developers and the merely curious: these are the PRONOM registry entries for .cal.
| Format name | Version | MIME type | PUID |
|---|---|---|---|
| CALS Compressed Bitmap | — | — | x-fmt/28 |
| SuperCalc Spreadsheet | 4 | — | x-fmt/363 |
| SuperCalc Spreadsheet | 5 | — | x-fmt/364 |
| SuperCalc Spreadsheet | 1 | — | fmt/403 |
| Broderbund The Print Shop/PrintMaster/American Greetings Project | 10-23 | — | fmt/1300 |
| PrintMaster Gold Project | 1 | — | fmt/1302 |