diff --git a/.changeset/windows-fixture-filenames.md b/.changeset/windows-fixture-filenames.md
new file mode 100644
index 0000000..8e87798
--- /dev/null
+++ b/.changeset/windows-fixture-filenames.md
@@ -0,0 +1,16 @@
+---
+"@agentcommercekit/did": patch
+---
+
+Rename `did:pkh` test fixture files to remove `:` characters, which are
+invalid in Windows filenames
+
+The three JSON fixtures under `test-fixtures/did-pkh/` used the literal
+`did:pkh:...` URI (colons included) as their filename. `:` is a reserved
+character on Windows/NTFS, so these files failed to check out correctly on
+Windows, breaking `pkh-did-resolver.test.ts` for Windows contributors and CI
+runners.
+
+Renamed the three fixtures to replace `:` with `_` (e.g.
+`did_pkh_eip155_1_0x....json`) and updated the corresponding static imports
+in `pkh-did-resolver.test.ts`. File contents are unchanged.
diff --git a/packages/did/src/did-resolvers/pkh-did-resolver.test.ts b/packages/did/src/did-resolvers/pkh-did-resolver.test.ts
index b38d401..217695d 100644
--- a/packages/did/src/did-resolvers/pkh-did-resolver.test.ts
+++ b/packages/did/src/did-resolvers/pkh-did-resolver.test.ts
@@ -1,8 +1,8 @@
 import { describe, expect, it } from "vitest"
 
-import fixtureEthereumMainnet from "../../test-fixtures/did-pkh/did:pkh:eip155:1:0xb9c5714089478a327f09197987f16f9e5d936e8a.json"
-import fixtureBaseSepolia from "../../test-fixtures/did-pkh/did:pkh:eip155:84532:0xa0ae58da58dfa46fa55c3b86545e7065f90ff011.json"
-import fixtureSolana from "../../test-fixtures/did-pkh/did:pkh:solana:4sGjMW1sUnHzSxGspuhpqLDx6wiyjNtZ:CKg5d12Jhpej1JqtmxLJgaFqqeYjxgPqToJ4LBdvG9Ev.json"
+import fixtureEthereumMainnet from "../../test-fixtures/did-pkh/did_pkh_eip155_1_0xb9c5714089478a327f09197987f16f9e5d936e8a.json"
+import fixtureBaseSepolia from "../../test-fixtures/did-pkh/did_pkh_eip155_84532_0xa0ae58da58dfa46fa55c3b86545e7065f90ff011.json"
+import fixtureSolana from "../../test-fixtures/did-pkh/did_pkh_solana_4sGjMW1sUnHzSxGspuhpqLDx6wiyjNtZ_CKg5d12Jhpej1JqtmxLJgaFqqeYjxgPqToJ4LBdvG9Ev.json"
 import { resolve } from "./pkh-did-resolver"
 
 /**
diff --git a/packages/did/test-fixtures/did-pkh/did:pkh:eip155:1:0xb9c5714089478a327f09197987f16f9e5d936e8a.json b/packages/did/test-fixtures/did-pkh/did_pkh_eip155_1_0xb9c5714089478a327f09197987f16f9e5d936e8a.json
similarity index 100%
rename from packages/did/test-fixtures/did-pkh/did:pkh:eip155:1:0xb9c5714089478a327f09197987f16f9e5d936e8a.json
rename to packages/did/test-fixtures/did-pkh/did_pkh_eip155_1_0xb9c5714089478a327f09197987f16f9e5d936e8a.json
diff --git a/packages/did/test-fixtures/did-pkh/did:pkh:eip155:84532:0xa0ae58da58dfa46fa55c3b86545e7065f90ff011.json b/packages/did/test-fixtures/did-pkh/did_pkh_eip155_84532_0xa0ae58da58dfa46fa55c3b86545e7065f90ff011.json
similarity index 100%
rename from packages/did/test-fixtures/did-pkh/did:pkh:eip155:84532:0xa0ae58da58dfa46fa55c3b86545e7065f90ff011.json
rename to packages/did/test-fixtures/did-pkh/did_pkh_eip155_84532_0xa0ae58da58dfa46fa55c3b86545e7065f90ff011.json
diff --git a/packages/did/test-fixtures/did-pkh/did:pkh:solana:4sGjMW1sUnHzSxGspuhpqLDx6wiyjNtZ:CKg5d12Jhpej1JqtmxLJgaFqqeYjxgPqToJ4LBdvG9Ev.json b/packages/did/test-fixtures/did-pkh/did_pkh_solana_4sGjMW1sUnHzSxGspuhpqLDx6wiyjNtZ_CKg5d12Jhpej1JqtmxLJgaFqqeYjxgPqToJ4LBdvG9Ev.json
similarity index 100%
rename from packages/did/test-fixtures/did-pkh/did:pkh:solana:4sGjMW1sUnHzSxGspuhpqLDx6wiyjNtZ:CKg5d12Jhpej1JqtmxLJgaFqqeYjxgPqToJ4LBdvG9Ev.json
rename to packages/did/test-fixtures/did-pkh/did_pkh_solana_4sGjMW1sUnHzSxGspuhpqLDx6wiyjNtZ_CKg5d12Jhpej1JqtmxLJgaFqqeYjxgPqToJ4LBdvG9Ev.json