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

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SQI file extension - Squish message base index

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:

You cannot access these files manually.

How to convert:

Probably cannot be converted to anything else.

Related links:

Squish entry on Wikipedia

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