This article briefly explains the most common file extensions used by ProSeries to store information.
| ProSeries File Extension | Type | More Information | Default Directory |
|---|
| .cache file. | Cache | Starting in ProSeries 2020 and newer Cache files are snapshots of the client file that are used to display and maintain the HomeBase with up to date information. | YYData |
| 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 |
