downrev question

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hello 
 i have 17.4 and our customer send us a file designed on 22.1. 
 
 i was able to open a 22.1 file on 17.4 without downrev. 
 
 i recall i was not able to open a 17.4 file on 16.x without downrev. 
 
 did cadence change the policy? 
 
 regards 
 masa

JuanCR · Accepted Answer

Hi Masa, 
 
 Taken from the "What's New" document for the 22.1 release: 
 
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 Database Format 
 You can open any release 17.4-2019 design in release 22.1 or, conversely, a release 22.1 design in release 17.4-2019 without any need to migrate the database format because the same database format is used across the two releases. 
 The 17.2 Database Compatibility Mode can still be enabled in User Preferences Editor to allow release 17.2 designs to be opened in releases 17.4 or 22.1 without updating the database version. Designs opened in the compatibility mode can be opened in release 17.2. 
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 You can read more about it in the following link: 
 Title: Cadence OrCAD and Allegro: Whats New in Release 22.1 and Quarterly Incremental Releases (QIR) -- Cadence OrCAD and Allegro: What&rsquo;s New in Release 22.1 - Database Format URL: support.cadence.com/.../techpubDocViewerPage

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