
If BagMRU Size is not found, right click on a blank space in the right pane, then select New, and then click DWORD (32-bit) Value.
If you can see BagMRU Size value in the right pane, skip this step. HKEY_CURRENT_USER\Software\Classes\Local Settings\Software\Microsoft\Windows\Shell Navigate to the following registry key:. You should try reset all folder settings to clean state (which will delete the BagMRU and Bags registry keys) before changing the BagMRU Size. To avoid the cache memory for folder customization settings run out of space, users can increase the memory cache space allocated in the registry for the folder settings, which is assigned in registry as BagMRU Size. In this case, it’s possibly due to not enough space in memory space allocated in registry. However, after a while, the problematic symptom starts happening again, and any changes on folder types and folder views again fail to be recorded and saved by Windows system. There is also occasional case where deleting Bag registry key entries to reset folders state fixes the problem on the computer. In addition, window size and position may not reopened exactly the last time it closed. As the result, folder may display incorrect thumbnail, or no thumbnail at all. For example, the folder template that users setup such as specifying a folder to be a documents folder with details view, Windows will overwrite and override the setting, then switching the folder type to pictures with icons view. Such illogical and weird folders behavior includes the the view or type set on a folder been reverted and changed back to last settings even after been customized by user. The ‘forgotten’ and lost folder views and types settings problem is likely to be caused by abnormal behavior of Windows on folders customization. Instead, the view and/or type of folders revert back to previous settings and configurations when the window is re-opened.
However, there is reported problems that Windows sometimes simply does not want to remember, save and store the changes to folder types and folder views after users customize them. Hardly anybody has so many nested folders of more than 5000. Theoretically, amount of 5000 should be more than enough for most Windows users. The upper limit of 5000 has remained through Windows Vista, Windows 7, Windows 8, Windows 8.1 and Windows 10. By default, Windows is configured to have cache memory storage space with size of 5000 folders to store the folder settings, a value for the ‘Bag’ that has also been increased in Windows XP SP2 compared to just 400 in Windows XP SP1 or earlier. All customizations and changes that has been done on folders types and folders views are saved and remembered by Windows OS in system registry.