# List of shell icon overlay identifiers

Shell icon overlays are icons that Microsoft Windows can display on top of folder icons. A list of icon overlays is specified in the Windows Registry in the location mentioned further in this article. In the current implementation there are 4 bits in a structure that define the overlay index providing for a maximum of 15 overlays, 4 of which are reserved by the operating system. Therefore, even though more than 11 icon overlay handlers can be registered, only the first 11 icon overlays supplied by icon overlay handlers are effectively displayed. The remaining icon overlay handlers are not used.
Many applications such as versioning software like TortoiseSVN and cloud storage synchronization software like Nextcloud, Dropbox, and OneDrive add their own icon overlay handlers to the Registry upon installation. Below is a table of shell icon overlay identifiers by software.

## Location

All shell icon overlay identifiers are located in the Windows Registry.

## List

| Category | Software | Registry Name | Icon | Description (Symbol) | Icon Version (Date) | Source |
| Cloud Storage Services | Adobe Creative Cloud | AccExtIco1 | | Synced file or folder; finished sync. | | |
| Cloud Storage Services | Adobe Creative Cloud | AccExtIco2 | | In process of syncing to ACC servers. (Symbol: Horizontal blue arrows) | | |
| Cloud Storage Services | Adobe Creative Cloud | AccExtIco3 | | unknown (Symbol: unknown) | | |
| Cloud Storage Services | Dropbox | DropboxExt01 | | Synced file or folder; finished sync. Downloaded local content on your hard drive. (Symbol: Solid Green check ✓) | v73.4.118(May 24, 2019) | See inside each cell. |
| Cloud Storage Services | Dropbox | DropboxExt02 | | Sync in progress; in process of syncing to Dropbox servers. (Symbol: Blue w/ rotating arrow) | v73.4.118(May 24, 2019) | See inside each cell. |
| Cloud Storage Services | Dropbox | DropboxExt03 | | (Year: 2019): Sync not happening; something wrong due to invalid file names, permission error, rapid multiple edits, or out of storage space. (Symbol: Red X) OR (Year: 2014) | v73.4.118(May 24, 2019) | See inside each cell. |
| Cloud Storage Services | Dropbox | DropboxExt04 | | (Year: 2019): A file or folder is not syncing when using the Selective-sync feature (meaning you have opted not to sync this file or folder on your computer). In general, selectively synced files or folders will not appear in Dropbox Folder on your computer. However, if you create two files or folders with the same name, the gray icon will appear, indicating that one of the files is not being synced. (Symbol: Gray minus) OR(Year: 2014) | v73.4.118(May 24, 2019) | See inside each cell. |
| Cloud Storage Services | Dropbox | DropboxExt05 | | (Year: 2019): Locked: Synced!; View-only access to file or folder. Read-only, cannot edit or share with others. Request edit access with owner. (Symbol: Green check ✓ w/ Lockpad) OR(Year: 2014) | v73.4.118(May 24, 2019) | See inside each cell. |
| Cloud Storage Services | Dropbox | DropboxExt06 | | (Year: 2019): Locked: Sync in progress; View-only access to file or folder. Read-only, cannot edit or share with others. Request edit access with owner. (Symbol: Blue w/ rotating arrows and w/ Lockpad) OR(Year: 2014) | v73.4.118(May 24, 2019) | See inside each cell. |
| Cloud Storage Services | Dropbox | DropboxExt07 | | (Year: 2019): SmartSync feature, Online-Only content. These appear in your Dropbox Folder on your computer, but they are not fully downloaded. Placeholder icons. (Symbol: Grey w/ white cloud shape) OR(Year: 2014) | v73.4.118(May 24, 2019) | See inside each cell. |
| Cloud Storage Services | Dropbox | DropboxExt08 | | (Year: 2019): SmartSync feature, Online-Only content. These appear in your Dropbox Folder on your computer, but they are not fully downloaded. Placeholder icons.View-only access to file or folder. Read-only, cannot edit or share with others. Request edit access with owner. (Symbol: Grey w/ white cloud shape and w/ Lockpad) OR(Year: 2014) | v73.4.118(May 24, 2019) | See inside each cell. |
| Cloud Storage Services | Dropbox | DropboxExt09 | | Mixed State: contains both local and online-only files. (Symbol: White and Green check ✓) | v73.4.118(May 24, 2019) | See inside each cell. |
| Cloud Storage Services | Dropbox | DropboxExt10 | | Locked: Read-only; Mixed State: contains both local and online-only files. (Symbol: White and Green check ✓ w/ Lockpad) | v73.4.118(May 24, 2019) | See inside each cell. |
| Cloud Storage Services | OneDrive Personal | OneDrive1 | | Cannot Sync (i.e. ErrorOverlayHandler Class) (Symbol:Red X) | v19.070 (May 13, 2019) | 1,2,3,4 |
| Cloud Storage Services | OneDrive Personal | OneDrive2 | | Shared with others (i.e. [SharedOverlayHandler Class) (Symbol:Green + People) | v19.070 (May 13, 2019) | 1,2,3,4 |
| Cloud Storage Services | OneDrive Personal | OneDrive3 | | Online-only files do not take up space on your device, file is only available online, but can be downloaded with internet. (i.e. UpToDateCloudOverlayHandler Class) (Symbol: Blue cloud) | v19.070 (May 13, 2019) | 1,2,3,4 |
| Cloud Storage Services | OneDrive Personal | OneDrive4 | | Files is "Always-keep-on device". 'Always available files' download to device and take up space, always available even without internet. (i.e. UpToDatePinnedOverlayHandler Class) (Symbol: Green ✓ w/ solid green background) | v19.070 (May 13, 2019) | 1,2,3,4 |
| Cloud Storage Services | OneDrive Personal | OneDrive5 | | Sync in progress (i.e. SyncingOverlayHandler Class) (Symbol: Rotating blue arrows) | v19.070 (May 13, 2019) | 1,2,3,4 |
| Cloud Storage Services | OneDrive Personal | OneDrive6 | | Locked (read only); Has settings preventing it from syncing. (i.e. [ReadOnlyOverlayHandler Class) (Symbol: Green Lockpad) | v19.070 (May 13, 2019) | 1,2,3,4 |
| Cloud Storage Services | OneDrive Personal | OneDrive7 | | When you open an online-only file, it downloads to your device and becomes locally available file, even without internet. (i.e. UpToDateUnpinnedOverlayHandler Class) (Symbol: Green ✓ w/ white background) | v19.070 (May 13, 2019) | 1,2,3,4 |
| Cloud Storage Services | OneDrive for Business (formerly SkyDrive) | SkyDrivePro1 (ErrorConflict) | | Error Conflict (Symbol: Red X) | v19.070 (May 13, 2019) | 1 |
| Cloud Storage Services | OneDrive for Business (formerly SkyDrive) | SkyDrivePro2 (SyncInProgress) | | Sync in Progress (Symbol: Blue rotating arrow) | v19.070 (May 13, 2019) | 1 |
| Cloud Storage Services | OneDrive for Business (formerly SkyDrive) | SkyDrivePro3 (InSync) | | In Sync (Symbol: Solid Green check ✓) | v19.070 (May 13, 2019) | 1 |
| Cloud Storage Services | NextCloud | OCError | | Sync Error or Blacklisted file (Symbol: Red X) | v2.5(Apr 11, 2019) | 1 |
| Cloud Storage Services | NextCloud | OCOK | | File is Synced w/ server (Symbol: Solid Green check ✓) | v2.5(Apr 11, 2019) | 1 |
| Cloud Storage Services | NextCloud | OCOKShared | | Shared (Symbol: Green share icon) | v2.5(Apr 11, 2019) | 1 |
| Cloud Storage Services | NextCloud | OCSync | | Sync in progress (Symbol: Blue w/ rotating arrow) | v2.5(Apr 11, 2019) | 1 |
| Cloud Storage Services | NextCloud | OCWarning | | Sync Error or Warning (Symbol: Yellow exclamation !) | v2.5(Apr 11, 2019) | 1 |
| Cloud Storage Services | Google Backup & Sync (formerly Google Drive) | GoogleDriveBlacklisted | | Not able to Sync (Symbol: Red X) | v3.43.4275 (Oct 15, 2018) | 1 |
| Cloud Storage Services | Google Backup & Sync (formerly Google Drive) | GoogleDriveSynced | | Synced (Symbol: Green check ✓) | v3.43.4275 (Oct 15, 2018) | 1 |
| Cloud Storage Services | Google Backup & Sync (formerly Google Drive) | GoogleDriveSyncing | | Sync in progress (Symbol: Rotating blue arrows) | v3.43.4275 (Oct 15, 2018) | 1 |
| Cloud Storage Services | odrive | 0drive.Active | | Sync in progress (Symbol: Fuchsia w/ rotating white arrows) | v6627 (Jul 01, 2020) | |
| Cloud Storage Services | odrive | 0drive.Synced | | Synced (Symbol: Light blue w/ white check ✓) | v6627 (Jul 01, 2020) | |
| Source Code Management System clients | TortoiseSVN, TortoiseGit and TortoiseHg | Tortoise1Normal | | Normal (Symbol: Solid Green check ✓) | v1.12.0 (Apr 17, 2019) | 1,2 |
| Source Code Management System clients | TortoiseSVN, TortoiseGit and TortoiseHg | Tortoise2Modified | | Modified (Symbol: Red !) | v1.12.0 (Apr 17, 2019) | 1,2 |
| Source Code Management System clients | TortoiseSVN, TortoiseGit and TortoiseHg | Tortoise3Conflict | | Conflict (Symbol: Yellow triangle !) | v1.12.0 (Apr 17, 2019) | 1,2 |
| Source Code Management System clients | TortoiseSVN, TortoiseGit and TortoiseHg | Tortoise4Locked | | Locked (Symbol: Yellow Lockpad) | v1.12.0 (Apr 17, 2019) | 1,2 |
| Source Code Management System clients | TortoiseSVN, TortoiseGit and TortoiseHg | Tortoise5ReadOnly | | Read only (Symbol: Grey check ✓) | v1.12.0 (Apr 17, 2019) | 1,2 |
| Source Code Management System clients | TortoiseSVN, TortoiseGit and TortoiseHg | Tortoise6Deleted | | Deleted (Symbol: Red X) | v1.12.0 (Apr 17, 2019) | 1,2 |
| Source Code Management System clients | TortoiseSVN, TortoiseGit and TortoiseHg | Tortoise7Added | | Added (Symbol: Blue plus +) | v1.12.0 (Apr 17, 2019) | 1,2 |
| Source Code Management System clients | TortoiseSVN, TortoiseGit and TortoiseHg | Tortoise8Ignored | | Ignored (Symbol: Grey minus) | v1.12.0 (Apr 17, 2019) | 1,2 |
| Source Code Management System clients | TortoiseSVN, TortoiseGit and TortoiseHg | Tortoise9Unversioned | | Unversioned (Symbol: Blue question mark ?) | v1.12.0 (Apr 17, 2019) | 1,2 |
| NTFS link Manage | Link Shell Extension | HardLinkMenu | | Context Menu | v3.9.3.1 (Nov 23, 2019) | |
| NTFS link Manage | Link Shell Extension | IconOverlayHardLink | / | Hardlink (Symbol: Red arrow) | v3.9.3.1 (Nov 23, 2019) | |
| NTFS link Manage | Link Shell Extension | IconOverlayJunction | / | Junction (Symbol: Metal link) | v3.9.3.1 (Nov 23, 2019) | |
| NTFS link Manage | Link Shell Extension | IconOverlaySymbolicLink | / | Symbolic Link (Symbol: Green arrow) | v3.9.3.1 (Nov 23, 2019) | |