List of shell icon overlay identifiers

Shell icon overlays are icons that Microsoft Windows can display on top of folder icons. Currently, there is a total of 15 slots allocated for icon overlays in the Windows Registry, 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.[1]

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.

Computer\HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Explorer\ShellIconOverlayIdentifiers

List
Category OS Software Registry Name Icon Description (Symbol) Icon Version (Date) Source
Cloud Storage Services Windows Dropbox DropboxExt01 [2][3] Synced file or folder; finished sync. Downloaded local content on your hard drive.[4] (Symbol: Solid Green check ✓) v73.4.118(May 24, 2019) See inside each cell.
DropboxExt02 [2][3] Sync in progress; in process of syncing to Dropbox servers.[4] (Symbol: Blue w/ rotating arrow)
DropboxExt03 [2] [2](Year: 2019): Sync not happening; something wrong due to invalid file names, permission error, rapid multiple edits, or out of storage space.[4] (Symbol: Red X) OR [3] (Year: 2014)
DropboxExt04 [2] [2](Year: 2019): A file or folder isn't syncing when using the Selective-sync feature (meaning you've opted not to sync this file or folder on your computer). In general, selectively synced files or folders won't 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 isn't being synced.[4] (Symbol: Gray minus) OR [3](Year: 2014)
DropboxExt05 [2] [2](Year: 2019): Locked: Synced!; View-only access to file or folder. Read-only, cannot edit or share with others. Request edit access with owner.[4] (Symbol: Green check ✓ w/ Lockpad) OR [3](Year: 2014)
DropboxExt06 [2] [2] (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.[4] (Symbol: Blue w/ rotating arrows and w/ Lockpad) OR [3](Year: 2014)
DropboxExt07 [2] [2](Year: 2019): SmartSync feature, Online-Only content. These appear in your Dropbox Folder on your computer, but they're not fully downloaded. Placeholder icons.[4] (Symbol: Grey w/ white cloud shape) OR [3](Year: 2014)
DropboxExt08 [2] [2](Year: 2019): SmartSync feature, Online-Only content. These appear in your Dropbox Folder on your computer, but they're 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.[4] (Symbol: Grey w/ white cloud shape and w/ Lockpad) OR [3](Year: 2014)
DropboxExt09 [2] Mixed State: contains both local and online-only files.[4] (Symbol: White and Green check ✓)
DropboxExt10 [2] Locked: Read-only; Mixed State: contains both local and online-only files.[4] (Symbol: White and Green check ✓ w/ Lockpad)
OneDrive Personal OneDrive1 Cannot Sync (i.e. ErrorOverlayHandler Class) (Symbol:Red X) v19.070 (May 13, 2019) 1,2,3,4
OneDrive2 Shared with others (i.e. [SharedOverlayHandler Class) (Symbol:Green + People)
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)
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)
OneDrive5 Sync in progress (i.e. SyncingOverlayHandler Class) (Symbol: Rotating blue arrows)
OneDrive6 Locked (read only); Has settings preventing it from syncing. (i.e. [ReadOnlyOverlayHandler Class) (Symbol: Green Lockpad)
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)
OneDrive for Business (formerly Sky Drive) SkyDrivePro1 (ErrorConflict) Error Conflict (Symbol: Red X) v19.070 (May 13, 2019) 1
SkyDrivePro2 (SyncInProgress) Sync in Progress (Symbol: Blue rotating arrow)
SkyDrivePro3 (InSync) In Sync (Symbol: Solid Green check ✓)
NextCloud OCError Sync Error or Blacklisted file (Symbol: Red X) v2.5(Apr 11, 2019) 1
OCOK File is Synced w/ server (Symbol: Solid Green check ✓)
OCOKShared Shared (Symbol: Green share icon)
OCSync Sync in progress (Symbol: Blue w/ rotating arrow)
OCWarning Sync Error or Warning (Symbol: Yellow exclamation !)
Google Backup & Sync (formerly Google Drive) GoogleDriveBlacklisted Not able to Sync (Symbol: Red X) v3.43.4275 (Oct 15, 2018) 1
GoogleDriveSynced Synced (Symbol: Green check ✓)
GoogleDriveSyncing Sync in progress (Symbol: Rotating blue arrows)
odrive 0drive.Active Sync in progress (Symbol: Fuchsia w/ rotating white arrows) v6627 (Jul 01, 2020)
0drive.Synced Synced (Symbol: Light blue w/ white check ✓)
Subversion Client Windows TortoiseSVN and TortoiseGit Tortoise1Normal Normal (Symbol: Solid Green check ✓) v1.12.0 (Apr 17, 2019) 1,2
Tortoise2Modified Modified (Symbol: Red !)
Tortoise3Conflict Conflict (Symbol: Yellow triangle !)
Tortoise4Locked Locked (Symbol: Yellow Lockpad)
Tortoise5ReadOnly Read only (Symbol: Grey check ✓)
Tortoise6Deleted Deleted (Symbol: Red X)
Tortoise7Added Added (Symbol: Blue plus +)
Tortoise8Ignored Ignored (Symbol: Grey minus)
Tortoise9Unversioned Unversioned (Symbol: Blue question mark ?)
NTFS link Manage Windows Link Shell Extension HardLinkMenu Context Menu v3.9.3.1 (Nov 23, 2019)
IconOverlayHardLink / Hardlink (Symbol: Red arrow)
IconOverlayJunction / Junction (Symbol: Metal link)
IconOverlaySymbolicLink / Symbolic Link (Symbol: Green arrow)

References
  1. "Registered icon overlay handlers aren't used by Windows Shell". Microsoft Windows Support. Oct 30, 2015. Archived from the original on May 31, 2019. Retrieved May 31, 2019.
  2. ., rwat128 (June 26, 2019). "Which Dropbox icon is for which Icon Overlay Identifier name?". SuperUser.com. Retrieved 2019-06-27.CS1 maint: numeric names: authors list (link)
  3. A, Danny (Oct 16, 2014). "Which Dropbox icon is for which Icon Overlay Identifier name?". SuperUser.com. Archived from the original on May 31, 2019. Retrieved 2019-06-21.
  4. "What do the sync icons mean and what should I do if they're missing?". help.dropbox.com. Archived from the original on June 21, 2019. Retrieved 2019-06-21.
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