Map any local folder to a drive letter (and stop fighting long Windows paths)

Windows paths have a habit of growing. C:\Users\you\Projects\client-abc\src\components\... — every tool, every terminal, every config file that stores an absolute path gets longer and longer. A drive letter collapses all of it.

Windows has subst for this, and it works. The problem is everything around it: subst is session-scoped (gone after a reboot), it's CLI-only, and there's no way to make a mapping come back automatically.

ScsSubst is a small Windows tool that does folder → drive letter properly:

• pick a folder, pick a drive letter, connect
• optional remount at startup, so your letters survive reboots
• multiple mappings, each with its own letter
• pure Windows APIs — no third-party filesystem driver to install
• optional visibility for elevated apps, Recycle Bin support, and more — off by default
• small portable build, clean UI, no ads
• 7-day trial on install
• currently on a limited-time lifetime deal — see the site for current pricing

Why people use this

Shorter paths. Z:\src\main.ts instead of a 90-character absolute path. This matters when you hit Windows' legacy path limits, and it matters every time a tool prints a path back to you.

Sandboxing. Give an AI agent (or any tool) its own folder and map it to its own letter. It can't wander into your real directories because it doesn't have a path to them.

Cleaner project roots. One letter per workspace, one letter per client, one letter per dataset.

Compared with the usual options

If you only need subst once in a terminal, the built-in command is genuinely fine. If you want a letter that's always there, ScsSubst is the comfortable version.

Limitations

• Windows only
• maps folders that already live on this PC — it is not a cloud/WebDAV mount
• it's a newer tool, so the community around it is still small

If you want cloud/WebDAV mounted as a real local disk instead, that's a different product — ScsDrive covers that side.