What is the ZXP file format?
Files with a .zxp extension are installer packages for Adobe's Common Extensibility Platform (CEP), used to add panels, scripts, and plug-ins to Creative Cloud applications.
What do .zxp files contain?
A .zxp file is a compressed installation archive built on the ZIP format, opening with the standard PK magic bytes and containing a required CSXS/manifest.xml that declares the extension ID, version, and target Adobe host apps. Adobe's Extension Manager - which allowed installing, removing, and (from CS6) exporting extension lists to XML for use on other machines - has since been retired; installation is now handled by the Creative Cloud desktop app via UPIA, or by third-party tools such as ZXPInstaller.
.zxp files can be digitally signed using a PKCS#7 signature appended after the ZIP structure. Installers automatically deploy signed packages; if no valid signature is present, the user is prompted before installation proceeds.
.zxp replaced the older .mxp format starting with Adobe CS5.5 (2011). All CC releases accept it, though newer UXP-based extensions use .ccx packages instead.
Security & safety
RISK: MEDIUMA ZXP installs code that runs inside your Adobe apps, so treat it like any plug-in: install only ZXPs from sources you trust (the vendor, Adobe Exchange, reputable marketplaces). An expired or invalid signature can block installation; some installers ask you to bypass signature checks - be cautious doing so. You can rename to .zip and inspect the scripts first. Pirated panels from sketchy sites are a real malware/credential-theft risk.
Format details
in a nutshell- ZX-Paintbrush document (.zxp) - Old Windows paint program ZX-Paintbrush saved images as .zxp - unrelated to Adobe; this is what the db_name mistakenly described.
Programs that open ZXP files
Windows3 apps
ZXPInstaller
Free Drag the .zxp onto the ZXPInstaller window; it installs the extension into your Adobe apps. The de facto replacement for Extension Manager.
Adobe UPIA (Creative Cloud desktop)
Free Keep the Creative Cloud app updated; vendor installers and Adobe Exchange use UPIA to install extensions. Newer add-ons install as .ccx from the in-app Plugins marketplace.
7-Zip (inspect only)
Open-source Rename .zxp to .zip (or open directly) to inspect the extension's files before installing - it's a ZIP. 
macOS2 apps
ZXPInstaller
Free Drag the .zxp onto the app to install the extension into your Adobe Creative Cloud apps on macOS.
Adobe UPIA (Creative Cloud desktop)
Free Update Creative Cloud; vendor/Exchange installers use UPIA. Newer add-ons arrive as .ccx via the in-app marketplace. Technical details
deep spec| Container format | ZIP archive; local file header magic bytes `50 4B 03 04` ("PK") at byte offset 0 |
| MIME type | `application/zip` |
| Internal manifest | `CSXS/manifest.xml` - required XML file inside the ZIP declaring extension ID, version, and Adobe host app targets via `HostList` |
| Extension engine | Adobe CEP (Common Extensibility Platform); panels run inside an embedded Chromium browser using HTML, CSS, and JavaScript |
| Developer SDK | Adobe CEP SDK (versions 4 through 11 covering CS5.5 through current CC releases) |
| Digital signature | Optional PKCS#7 code-signing certificate appended after the ZIP End-of-Central-Directory record without breaking ZIP parsing |
| Predecessor format | `.mxp` (Adobe Extension Manager Package), used in CS4 and earlier |
| Successor format | `.ccx` (Creative Cloud Extension package) used by the newer UXP-based extension runtime |
| Installer tools | Adobe UPIA (Unified Plugin Installer Agent) via Creative Cloud desktop app; third-party ZXPInstaller utility |
| Supported Adobe apps | Photoshop, Illustrator, InDesign, Premiere Pro, After Effects, Animate, Dreamweaver, and other CEP-capable CC applications |
| Extension types packaged | CEP HTML/JS panels, ExtendScript scripts (`.jsx`), binary plug-ins, and hybrid combinations of the above |
| ZIP inspection | Fully extractable with 7-Zip or any ZIP tool; compression uses standard DEFLATE - no proprietary encoding |
| Host version targeting | `HostList` element in `CSXS/manifest.xml` pins minimum and maximum CC app version ranges the extension supports |
| Install scope | Can target per-user or all-users installation path depending on OS permissions at install time |
| Released | Adobe CS5.5 (2011), replacing the older MXP extension format |
| Specification | developer.adobe.com |
ZXP conversions
Community Q&A
asked by usersNo questions yet - be the first to ask about ZXP files.
