# Sym Windows Companion 0.5.0-beta.41

Corrects beta40 attachment filenames. Plain-text and HTML Outlook drafts now preserve the original filename and extension across local-file, inline and chunked attachment routes. Optional local-file names are preserved too. Invalid and reserved Windows names are rejected before attachment mutation.

To attach a known local file without base64 in AI calls, enable **Attach files from this computer** and **Write drafts** in Companion > Plugins > Outlook. The operation requires the saved draft ID and current version, supports a regular local file up to 25 MiB, and never sends email. Existing permissions and approval rules are retained.

Validation: 64 isolated regressions passed (one Windows-only skipped on Linux), 63 Windows tests passed. A freshly rebuilt Outlook helper was verified inside the package. All six plain/HTML × local/inline/chunk draft cases preserved the exact PDF filename, MIME type and downloaded bytes. Local tests used 8 MiB files and covered the optional filename. An invalid later filename added no earlier attachment. All temporary drafts were deleted; no email was sent. Packaged startup, secure storage, documentation, 50 UI fixture scenes and private-network lifecycle/crash recovery passed.

The Windows preview installer is unsigned. Packaged qualification does not claim customer installation or automatic-upgrade acceptance. No Mac or Linux package is published. Source: kingmeers/sym-bridge PR88, commit 0b9905c60fe0d2727feaded2ea517f335ffc7c48.