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This article briefly explains the most common file extensions used by ProSeries to store information.

ProSeries client file types:

Form Type General ProSeries File Extension  Example using TY20 Name of HomeBase view  Usable by 
1040 YYi 20i Form 1040: Individual Basic/Professional
1040NR YYf 20f Form 1040NR: Nonresident Professional
1041 YYe 20e Form 1041: Estates/Trusts Professional
1065 YYp 20p Form 1065: Partnerships Professional
1120 YYc 20c Form 1120: Corporations Professional
1120S YYs 20s Form 1120S: S Corps Professional
706 YYr 20r Form 706: Estates Professional
709 YYg 20g Form 709: Gifts Professional
990 YYn 20n Form 990: Tax-Exempt Orgs Professional
ORG YYo 20o Organizer for 1040 Professional
ProSeries File Extension Type More Information Default Directory
jn1 Journal Contains location of client file for network installations only in ProSeries 2019 and prior. YYData
tmp Temporary Contains information caused by software terminating unexpectedly. YYData
lck Lock Stores access permissions to a file or feature. YYData; Common
cdx, dbf, ddf, lst, mbf HomeBase Stores data for HomeBase views and their corresponding fields. HomeBase
pmd ProSeries Basic HomeBase Stores data for the ProSeries Basic HomeBase views and their corresponding fields (from tax year 2015 to 2020) YYData (Ex. 18Data)
blb, dat, idx DMS Stores data including folder structure, client information, and client files. Open DMS and view Current Database Path
3us, 3uc, 3up FAM Fixed Asset Manager import files.  
inv Invoice Client invoice files. Common 
inv Update Contains module versions for update purposes.  Updates
dggn, hefs Forms Contains module versions for update purposes. Forms 
ltr, rtf Letters Contains letters and custom letters. Common 
lyt Modules Contains module code references for updating and installing. BasWinYY; ProWinYY; ProSeriesProNetYY_AutoDL20YY_Core