Files with sqi extension can be found as message base index files from old Squish/Fidonet.

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SQI file extension - Squish message base index file

What is sqi file? How to open sqi files?

File type specification:

Various data file type icon Various data file type

The sqi file extension was used for message base index files in old Squish program.

Squish is both the name of a FidoNet mail tossing application originally designed for DOS and OS/2, and the name of the primary mail storage format in which this application stores FidoNet and other local BBS messages.

Help how to open SQI files:

Due the variability and uncertainty of this file type group, there is no general information available, about how to open this various data file format. However most files with extension from this group are usually not meant to be opened or viewed directly. If there are associated applications or programs listed below the extension description, you can always try to check their website for additional informations on their forums or other type of customer support.

For general information try to look at:
Identifying unknown file formats

How to convert file with extension SQI:

Due the variability and uncertainty of this file type group, there is no general information available, about how to convert this various data file format. However most files with extension from this group are usually not in formats, which can be converted. If there are associated applications or programs listed below the extension description, you can always try to check their website for additional informations on their forums or other type of customer support.

Related links:

Squish entry on Wikipedia

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SQD file extension

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